[v3] Add level one headings to Markdown files. (#295)

All Markdown files should, from this point on, start with a level one heading. See exercism/configlet#150 for the rationale behind these changes. The full specification can be found [here](https://github.com/exercism/docs/blob/main/contributing/standards/markdown.md).
exercism · Feb 17, 2021 · 8ec254f · 8ec254f
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diff --git a/concepts/callbacks/about.md b/concepts/callbacks/about.md
@@ -1 +1,3 @@
+# About
+
 TODO: add information on callbacks concept
diff --git a/concepts/callbacks/introduction.md b/concepts/callbacks/introduction.md
@@ -1 +1,3 @@
+# Introduction
+
 TODO: add introduction for callbacks concept
diff --git a/concepts/errors-basic/about.md b/concepts/errors-basic/about.md
@@ -1 +1,3 @@
+# About
+
 TODO: add information on errors-basic concept
diff --git a/concepts/errors-basic/introduction.md b/concepts/errors-basic/introduction.md
@@ -1 +1,3 @@
+# Introduction
+
 TODO: add introduction for errors-basic concept
diff --git a/concepts/futures/about.md b/concepts/futures/about.md
@@ -1 +1,3 @@
+# About
+
 TODO: add information on futures concept
diff --git a/concepts/futures/introduction.md b/concepts/futures/introduction.md
@@ -1,3 +1,5 @@
+# Introduction
+
 TODO: the content below is copied from the exercise introduction and probably needs rewriting to a proper concept introduction
 
 ## futures
diff --git a/concepts/iterables-basic/about.md b/concepts/iterables-basic/about.md
@@ -1 +1,3 @@
+# About
+
 TODO: add information on iterables-basic concept
diff --git a/concepts/iterables-basic/introduction.md b/concepts/iterables-basic/introduction.md
@@ -1 +1,3 @@
+# Introduction
+
 TODO: add introduction for iterables-basic concept
diff --git a/concepts/numbers-basic/about.md b/concepts/numbers-basic/about.md
@@ -1 +1,3 @@
+# About
+
 TODO: add information on numbers-basic concept
diff --git a/concepts/numbers-basic/introduction.md b/concepts/numbers-basic/introduction.md
@@ -1,3 +1,5 @@
+# Introduction
+
 TODO: the content below is copied from the exercise introduction and probably needs rewriting to a proper concept introduction
 
 ## numbers-basic

diff --git a/concepts/recursion/about.md b/concepts/recursion/about.md
@@ -1 +1,3 @@
+# About
+
 TODO: add information on recursion concept
diff --git a/concepts/recursion/introduction.md b/concepts/recursion/introduction.md
@@ -1 +1,3 @@
+# Introduction
+
 TODO: add introduction for recursion concept
diff --git a/concepts/strings-basic/about.md b/concepts/strings-basic/about.md
@@ -1 +1,3 @@
+# About
+
 TODO: add information on strings-basic concept
diff --git a/concepts/strings-basic/introduction.md b/concepts/strings-basic/introduction.md
@@ -1,3 +1,5 @@
+# Introduction
+
 Strings are useful for holding data that can be represented in text form. Some
 of the most-used operations on strings are to check their `length`, to build
 and concatenate them using the `+` and `+=` string operators, checking for the

diff --git a/concepts/type-conversion/about.md b/concepts/type-conversion/about.md
@@ -1 +1,3 @@
+# About
+
 TODO: add information on type-conversion concept
diff --git a/concepts/type-conversion/introduction.md b/concepts/type-conversion/introduction.md
@@ -1,3 +1,5 @@
+# Introduction
+
 TODO: the content below is copied from the exercise introduction and probably needs rewriting to a proper concept introduction
 
 ## numbers-basic

diff --git a/docs/ABOUT.md b/docs/ABOUT.md
@@ -1,3 +1,5 @@
+# About
+
 Dart brings object-oriented and typing together with the flexibility that JavaScript is known for.  It is designed to simplify common programming tasks. In recent years, its popularity in the software development community has grown tremendously.
 
 To dig deeper into Dart, [click here](https://www.dartlang.org/guides/language/language-tour).

diff --git a/docs/INSTALLATION.md b/docs/INSTALLATION.md
@@ -1,3 +1,5 @@
+# Installation
+
 ## Installing Dart
 
 ### Automatic installation instructions (recommended)

diff --git a/docs/LEARNING.md b/docs/LEARNING.md
@@ -1,4 +1,4 @@
-## Recommended Learning Resources
+# Recommended Learning Resources
  * [Dart Language Overview](https://www.dartlang.org/guides/language/language-tour)
  * [Getting Started](https://www.dartlang.org/tutorials/dart-vm/get-started)
  * [Make a command line app](https://www.dartlang.org/tutorials/dart-vm/cmdline)

diff --git a/exercises/concept/futures/.docs/hints.md b/exercises/concept/futures/.docs/hints.md
@@ -0,0 +1,2 @@
+# Hints
+
diff --git a/exercises/concept/futures/.docs/instructions.md b/exercises/concept/futures/.docs/instructions.md
@@ -0,0 +1,2 @@
+# Instructions
+
diff --git a/exercises/concept/futures/.docs/introduction.md b/exercises/concept/futures/.docs/introduction.md
@@ -0,0 +1,2 @@
+# Introduction
+
diff --git a/exercises/concept/numbers/.docs/hints.md b/exercises/concept/numbers/.docs/hints.md
@@ -0,0 +1,2 @@
+# Hints
+
diff --git a/exercises/concept/numbers/.docs/instructions.md b/exercises/concept/numbers/.docs/instructions.md
@@ -0,0 +1,2 @@
+# Instructions
+
diff --git a/exercises/concept/numbers/.docs/introduction.md b/exercises/concept/numbers/.docs/introduction.md
@@ -1,3 +1,5 @@
+# Introduction
+
 ## Numbers Basic
 
 ## Type Conversion
diff --git a/exercises/concept/strings/.docs/hints.md b/exercises/concept/strings/.docs/hints.md
@@ -0,0 +1,2 @@
+# Hints
+
diff --git a/exercises/concept/strings/.docs/instructions.md b/exercises/concept/strings/.docs/instructions.md
@@ -0,0 +1,2 @@
+# Instructions
+
diff --git a/exercises/concept/strings/.docs/introduction.md b/exercises/concept/strings/.docs/introduction.md
@@ -1,3 +1,5 @@
+# Introduction
+
 Strings are useful for holding data that can be represented in text form. Some
 of the most-used operations on strings are to check their `length`, to build
 and concatenate them using the `+` and `+=` string operators, checking for the

diff --git a/exercises/practice/phone-number/.docs/instructions.append.md b/exercises/practice/phone-number/.docs/instructions.append.md
@@ -1,4 +1,4 @@
-## Tip
+# Tip
 
 A function with a *return type* can only return data of that *type* and `null`.
 However the function caller is only expecting one data type.