Add clarifications suggested by Nefel

One concern was the potential for confusion between editors that provide
built-in Git support, and command-line editors that can be used to write
commit messages.

docs/contributors.md

@@ -7,3 +7,4 @@ Here is a list of the contributors who have helped develop these materials:
 - James Ong ([jomonman537](https://github.com/jomonman537))
 - Trish Campbell ([TrishC](https://github.com/TrishC))
 - Isobel Abell ([iabell](https://github.com/iabell))
+- Nefel Tellioglu Cetinkaya ([nefeltellioglu](https://github.com/nefeltellioglu))

docs/using-git/graphical-git-clients.md

@@ -1,12 +1,14 @@
 # Graphical Git clients
 
-While Git is a command-line program, there are other ways to work with Git repositories:
+In this book we will primarily show how to use Git **from the command-line**.
+If you don't have Git already installed on your computer, see these [instructions for installing Git](https://git-scm.com/book/en/v2/Getting-Started-Installing-Git).
+
+In addition to using the command-line, there are other ways to work with Git repositories:
 
 - There are many [graphical clients](https://git-scm.com/downloads/guis) that you can download and use;
 
-- Many editors include Git support (e.g., [Atom](https://atom.io/), [RStudio](https://www.rstudio.com/), [Visual Studio Code](https://code.visualstudio.com/)); and
+- Many editors include **built-in** Git support (e.g., [Atom](https://atom.io/), [RStudio](https://www.rstudio.com/), [Visual Studio Code](https://code.visualstudio.com/)); and
 
 - Online platforms such as [GitHub](https://github.com/), [GitLab](https://gitlab.com/public), and [Bitbucket](https://bitbucket.org/) also provide a graphical interface for common Git actions.
 
-In this book we will primarily show how to use Git **from the command-line**, but all of the concepts and terminology should also apply to all of the tools described above.
-If you don't have Git already installed on your computer, see these [instructions for installing Git](https://git-scm.com/book/en/v2/Getting-Started-Installing-Git).
+All of the concepts and terminology you will learn in this book should also apply to all of the tools listed above.