expect that those comments are written by people who can be quite literate and grammatically proper when they wish to be. more about context; in code the punctuation has different meaning and the language is accessory to that already.
alternately, terse comments on top of GnarlyNaming.Conventions.andVerboseclass.HeirArchies.plus_GoofyCapitalizations and so forth might just indicate that programming causes brain damage, specifically to the language centers.