Update the clang and clang-tools-extra code owners files

This also converts the Clang code owners file from a flat text file to
an RST file that is linked in to the rest of our documentation.

The RFC for this can be found at:
https://discourse.llvm.org/t/rfc-proposed-changes-to-clangs-code-ownership/

Differential Revision: https://reviews.llvm.org/D132550
diff --git a/clang-tools-extra/CODE_OWNERS.TXT b/clang-tools-extra/CODE_OWNERS.TXT
index 3dc3ddd..4cf80aa 100644
--- a/clang-tools-extra/CODE_OWNERS.TXT
+++ b/clang-tools-extra/CODE_OWNERS.TXT
@@ -4,26 +4,27 @@
 in or not.
 
 The list is sorted by surname and formatted to allow easy grepping and
-beautification by scripts.  The fields are: name (N), email (E), web-address
-(W), PGP key ID and fingerprint (P), description (D), and snail-mail address
-(S).
+beautification by scripts.  The fields are: name (N), email (E), Phabricator
+handle (H), and description (D).
 
 N: Aaron Ballman
 E: [email protected]
+H: aaron.ballman
 D: clang-query
 
-N: Manuel Klimek
-E: [email protected]
-D: clang-rename, all parts of clang-tools-extra not covered by someone else
-
-N: Alexander Kornienko
-E: [email protected]
-D: clang-tidy
-
 N: Julie Hockett
 E: [email protected]
 D: clang-doc
 
+N: Nathan James
+E: [email protected]
+H: njames93
+D: clang-tidy
+
+N: Manuel Klimek
+E: [email protected]
+D: clang-rename, all parts of clang-tools-extra not covered by someone else
+
 N: Sam McCall
 E: [email protected]
 D: clangd