Small fixes leftover from V16 merge.

[ Merge of http://go/wvgerrit/93505 ]

During the merge process there were a few CL comments (ag/10122083)
that were not able to be addressed.  Most changes in the CL are
spelling / grammar corrections.

Bug: 148907684
Bug: 141247171
Test: CDM unit tests
Change-Id: I9a8648525bbe5ed319521ebf01741a958ab69ae2

libwvdrmengine/cdm/core/src/cdm_engine.cpp

@@ -1475,7 +1475,6 @@ CdmResponseType CdmEngine::ReleaseUsageInfo(
   }
 
   CdmResponseType status = usage_session_->ReleaseKey(message);
-  // Q: Should this only be reset if release key was successful?
   usage_session_.reset();
   if (NO_ERROR != status) {
     LOGE("ReleaseKey failed: status = %d", status);