"Minor fmt" or "fmt" errors are corrections to various whitespace, on the same line as a heading, after the last equal sign. Whitespace after the heading is vandalism to exploit the known bug of messing up the section-edit count. (Subsequent edits done by clicking the right-most column  tag will usually edit the wrong section, if the whitespace is left after the last equal sign.) If it looks like I'm only making trivial whitespace edits, rest assured, I'm not.
Languages are wikified/dewikified according to the arcane "top-40" languages list that someone maintains.
Many bogus headings are automatically renamed to the more standard headings. Most headings are corrected to "Sentence case" instead of "Title Case."