Fix some whitespace errors in docs.

Remove trailing whitespace and add additional whitespace where
necessary.
cmMakefile: Do not track configured files known to be temporary

Since commit ad502502 (cmMakefile: Track configured files so we can
regenerate them, 2013-06-18) cmMakefile::ConfigureFile records the
configured file as an output file generated by CMake.  The intention is
that for make and ninja we can re-run CMake when one of the files it
generates goes missing.  However, files configured temporarily in
CMakeTmp directories by Check* modules do not live past the CMake
invocation.

Teach cmMakefile::FinalPass to stop tracking files that don't
exist after we are finished generation.
Merge topic 'no_track_configured_files'

0264eec cmMakefile: Do not track configured files known to be temporary
Merge topic 'fix-docs-whitespace'

3580b9f Fix some whitespace errors in docs.