Various typo fixes - only in comments, no code changes.
Various typo fixes - only in comments, no code changes.
Merge pull request #806 from Cylindric3D/typofixes_upstream

Various typo fixes #4 - only in comments, no code changes.
Merge pull request #807 from Cylindric3D/typofixes_upstream5

Various typo fixes #5 - only in comments, no code changes.