docs/comments: fix more doubled-word typos

Follow-up to #17926, addressing the four additional instances flagged
by @garoto:

- DOCS/man/options.rst: "output size size is limited" -> "output size is limited"
- DOCS/man/input.rst: "Called after after a file" -> "Called after a file"
- video/out/gpu/video.c: "target target that needs to be written" -> "target that needs to be written"
- video/out/x11_common.c: "enable DPMS only we we disabled it before" -> "enable DPMS only if we disabled it before"
  (this one wasn't a pure duplicate — the first "we" was a typo for "if"; the comment now matches the conditional on the line above)