Merge topic 'doc-3.18-fixups' into release-3.18

947cfc732d Help: Explicitly say transaction, don't abbreviate to trans
90c73479bc Help: Correct and condense examples for VS_SOLUTION_DEPLOY
0420de10b5 Help: Add missing cross-referencing for generator expressions
013f7a2647 Help: Formatting, crossref for FRAMEWORK_MULTI_CONFIG_POSTFIX_<CONFIG>
a12d53acf3 Help: Add missing PCH_WARN_INVALID docs and related cleanups
95a16f7805 Help: Fix formatting error and consistency for gtest_discover_tests()

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !4915