checkdoc-next-error is a compiled Lisp function in `
Find and return the next checkdoc error list, or nil.
Only documentation strings are checked.
An error list is of the form (WARNING . POSITION) where WARNING is the
warning text, and POSITION is the point in the buffer where the error
was found. We can use points and not markers because we promise not
to edit the buffer before point without re-executing this check.
Argument ENABLE-FIX will enable auto-fixing while looking for the next
error. This argument assumes that the cursor is already positioned to
perform the fix.