cleanup readme

Author: rdmsr

README.md

@@ -4,11 +4,11 @@ cppdoc is a C++ documentation generator inspired by `rustdoc`
 ## Features
 - `rustdoc`-like documentation comments, rendered using markdown
 - Documentation tests using codeblocks
-- Extra documentation pages in markdown
-- mermaid.js graphs
-- Flexible styling options, with user-supplied stylesheets (see default themes in `example/`)
+- Extra pages written in markdown
+- [Mermaid](https://mermaid.js.org) graphs
+- Flexible styling options with user-supplied stylesheets (see default themes in `example/`)
 - libclang-based parser with support for records, enums, functions and namespaces
-- Fair performance, with generation usually being faster than clang-backed Doxygen
+- Decent performance, with generation usually being faster than libclang-backed Doxygen
 
 ## Usage
 See [USAGE.md](USAGE.md)