Fix up docs for 2026.1 (#19890)
### Summary of the issue:
The user guide and changelog for NVDA 2026.1 contain various typos,
inconsistent capitalisation, broken anchors, incorrect key bindings, and
minor wording issues that should be resolved before the translation
freeze.
### Description of user facing changes:
- Fixed spelling and grammar throughout changes.md and userGuide.md
(e.g. "recognising" → "recognizing", "aides" → "aids", "inside of" →
"inside").
- Corrected inconsistent capitalisation (e.g. "unicode" → "Unicode",
"32bit" → "32-bit", "both" → "Both" at start of list items, consistent
"Enhanced mode" / "Simple mode" / "Character mode").
- Fixed incorrect key binding in the MathCAT navigation table: "Describe
placemarker" now correctly reads control+shift+1 through control+shift+0
instead of control+shift+1 through shift+0.
- Fixed a broken anchor {MathSpeechStyle} → {#MathSpeechStyle} and
corrected cross-reference anchors (#reportSpellingErrors →
#ReportSpellingErrors).
- Added missing heading anchor {#MathTypicalUse} to the "Typical Use"
section.
- Removed the obsolete "AsCompound" MathCAT chemistry option and renamed
"SpellOut" to "Spell it out" to match the current MathCAT UI.
- Improved clarity of wording in the spelling/grammar error reporting
settings, add-on copy to system configuration, and add-on store
changelog sections.
- Added missing issue reference (#18956) to a changelog entry.
- Fixed minor formatting issues (missing space before backtick, extra
space before comma).
### Description of developer facing changes:
None
### Description of development approach:
Instructed Claude Code to review `user_docs/en/changes.md` and
`user_docs/en/userGuide.md`. Manually actioned its suggestions.
### Testing strategy:
- Manual review of the rendered documentation for correctness and
consistency.
- Verified that all cross-reference anchors resolve correctly.
### Known issues with pull request:
None
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Co-authored-by: Cyrille Bougot <cyrille.bougot2@laposte.net>
Co-authored-by: Luke Davis <8139760+XLTechie@users.noreply.github.com>
