[clang-tools-extra] Convert maintainers list to .rst format

Author: vbvictor

clang-tools-extra/Maintainers.txt renamed to clang-tools-extra/Maintainers.rst

@@ -2,9 +2,13 @@
 Clang Tools Extra Maintainers
 =============================
 
-This file is a list of the maintainers
-(https://llvm.org/docs/DeveloperPolicy.html#maintainers) for clang-tools-extra.
+This file is a list of the 
+`maintainers <https://llvm.org/docs/DeveloperPolicy.html#maintainers>`_
+for clang-tools-extra.
 
+.. contents::
+   :depth: 2
+   :local:
 
 Active Maintainers
 ==================