[clang] [clang][docs] Add all clang-tools-extra to 'ClangTools.rst' (PR #148622)

[via cfe-commits]

================
@@ -89,14 +89,49 @@ they'll be tracked here. The focus of this documentation is on the scope
 and features of the tools for other tool developers; each tool should
 provide its own user-focused documentation.
 
-``clang-tidy``
+``Clang-Doc``
+-------------
+
+`Clang-Doc <https://clang.llvm.org/extra/clang-doc.html>`_ is a tool for
+generating C and C++ documentation from source code and comments.
+
+``Clang-Include-Fixer``
+-----------------------
+
+`Clang-Include-Fixer <https://clang.llvm.org/extra/clang-include-fixer.html>`_
+automates the addition of missing ``#include`` directives in a C++ file. It adds
+missing namespace qualifiers to unidentified symbols when necessary.
+
+``Clang-Tidy``
 --------------
 
-`clang-tidy <https://clang.llvm.org/extra/clang-tidy/>`_ is a clang-based C++
+`Clang-Tidy <https://clang.llvm.org/extra/clang-tidy/>`_ is a clang-based C++
 linter tool. It provides an extensible framework for building compiler-based
 static analyses detecting and fixing bug-prone patterns, performance,
 portability and maintainability issues.
----------------
weirdsmiley wrote:

I found [this](https://github.com/llvm/llvm-project/commit/dec64d8e160697a7da3e8aa965beb5b43f8fff49) in the history. Is this suitable?

`
It can also add checks that advocate usage of modern (currently "modern" means "C++11") language constructs.
`

https://github.com/llvm/llvm-project/pull/148622