Docs: state which unknown-word choices are remembered

[niksedk]

Problem

Neither the OCR page nor the spell-check page said which of the unknown-word choices are remembered and which are not. Both list "Change all" and "Skip all" side by side with no hint that one is written to disk and the other disappears when the window closes.

That gap is what made #13284 ("Skip all choices are now remembered") look like a bug fix rather than a behaviour change: #10166 reads as a defect precisely because the documented behaviour never existed to contradict it.

Change

Documentation only — no code.

docs/features/ocr.md — a "What is remembered" table under Unknown Words:

Choice	Remembered?	Stored in
Change all	Yes	{language}_OCRFixReplaceList.xml
Add to names list	Yes	{language}_names.xml
Add to user dictionary	Yes	{language}_user.xml
Skip once	No	—
Skip all	No — current OCR session only	—

…plus a short paragraph on why "Skip all" is deliberately temporary (a mis-click should not have lasting consequences) and which choice to use instead when you do want something permanent.

docs/features/spell-check.md — the same distinction inline in the existing option list, with a shorter note.

Verified

• Change all → OcrFixEngine.ChangeAll → OcrFixReplaceList2.AddWordOrPartial → SaveWordToWordList, which writes <lang>_OCRFixReplaceList.xml. Persisted.
• Skip all → OcrFixEngine.SkipAll adds to the in-memory _wordSkipList only; it is created per engine instance and cleared by Unload(). Nothing reads or writes disk. Session-only.
• F1 targets land on these pages: the OCR window calls ShowHelp("features/ocr") (OcrViewModel.cs:4521) and the spell-check window calls ShowHelp("features/spell-check") (SpellCheckViewModel.cs:931).
• Swept all 70 ShowHelp(...) targets in src/ui against docs/<target>.md — every one resolves, none missing.

Related

• Closes the documentation half of OCR Keeps Re-Flagging Correct Characters — Skips/Resolves Not Remembered #10166. The remaining half is that 5.x lost the Tools.CheckOneLetterWords setting that 4.0.14 had (OcrFixEngine: correct = !Configuration.Settings.Tools.CheckOneLetterWords, defaulted to true in ToolsSettings.cs:541). It does not exist anywhere in src today, and there is no single-character branch in src/libuilogic/Ocr/FixEngine/OcrFixEngine.cs — so the supported way to stop single-letter prompts is gone. That is the likelier root fix for the reporter and is worth its own issue.
• Fix #10166: OCR skip-all choices are now remembered #13284 was closed in favour of keeping "Skip all" session-only.