Address reviewer suggestions.

Author: cmtice

libcxx/docs/Contributing.rst

@@ -330,13 +330,13 @@ has been merged, an LLVM premerge maintainer (a Google employee) must use
 terraform to apply the change to the running GKE cluster.
 
 
-monitoring premerge testing performance
+Monitoring premerge testing performance
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 The llvm-premerge-libcxx runners mentioned above collect metrics regarding the
 time the tests spend queued up before they start running and also the time it
 takes the tests to actually complete running. These metrics are collected and
-aggregated (based on stage and PR), and the results can be seen at this
+aggregated (based on stage and PR), and the results can be seen at the
 `Libc++ Premerge Testing dashboard
 <https://llvm.grafana.net/public-dashboards/0bd453e8b3034733a1b0ff8c7728086d>`__
 .