[Clang] Add Doug Wyatt and myself as maintainers for function effect analysis (llvm#117324)

Doug implemented quite literally all of it and has been continuously
improving the implementation by handling more language constructs we had
initially missed. I spent a lot of time reviewing the implementation of
the attributes as well as the analysis pass, so in other words, the two
of us are probably best equipped to answer any questions that might
arise wrt this part of Clang.

Author: Sirraide

clang/Maintainers.rst

@@ -176,6 +176,15 @@ Thread Safety Analysis
 | aaron.puchert\@sap.com (email), aaronpuchert (GitHub), aaronpuchert (Discourse)
 
 
+Function Effect Analysis
+~~~~~~~~~~~~~~~~~~~~~~~~
+| Doug Wyatt
+| dwyatt\@apple.com (email), dougsonos (GitHub), dougsonos (Discourse)
+
+| Sirraide
+| aeternalmail\@gmail.com (email), Sirraide (GitHub), Ætérnal (Discord), Sirraide (Discourse)
+
+
 Tools
 -----
 These maintainers are responsible for user-facing tools under the Clang