Cleanup comments

[mark-sil]

Eight comments across six files described the detail row's field menu as a "gear menu". There is no gear anywhere: it is a blue down-arrow in the legacy view and a three-dot button in Avalonia. They now say "menu-button", the term already used in LT-17670 and LT-19150 — which also stops the wrong word being copied into new comments.

Comments only. No executable code changed, so the build is the gate here; it validates the <see cref> references in the doc comments, and there is nothing for tests to exercise.

The diff is a little larger than eight word swaps. "menu-button" is two characters longer than "gear-menu", which pushed five lines past the width limit and tripped the comment-hygiene auto-rewrap, stranding single words ("composed", "view", "restores", "layout's", "change") on their own lines. Those blocks are hand-rewrapped so the prose reads normally and stays under the limit.

One further occurrence, the log message in RecordEditView.Avalonia.cs, is deliberately absent: it is already fixed in #1119, and touching it here would conflict.

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This change is 

[github-actions]

NUnit Tests

1 files ±0 1 suites ±0 12m 9s ⏱️ + 4m 5s
5 996 tests ±0 5 915 ✅ +1 81 💤 ±0 0 ❌ - 1 
6 005 runs ±0 5 924 ✅ +1 81 💤 ±0 0 ❌ - 1 

Results for commit 2862b4b. ± Comparison against base commit 8f46a80.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.55%. Comparing base (8f46a80) to head (2862b4b).

Additional details and impacted files

@@ Coverage Diff @@## main #1120 +/- ##
==========================================
- Coverage 38.55% 38.55% -0.01% 
==========================================
Files 1513 1513 Lines 350968 350968 Branches 40345 40345 ==========================================
- Hits 135322 135308 -14 - Misses 186429 186444 +15 + Partials 29217 29216 -1 

Files with missing lines	Coverage Δ
Src/Common/FwAvalonia/Detail/DetailModel.cs	77.95% <ø> (ø)
...nia/ViewDefinition/ViewDefinitionOverrideEditor.cs	88.54% <ø> (ø)
Src/xWorks/Avalonia/Composer/DetailComposer.cs	67.41% <ø> (ø)

... and 4 files with indirect coverage changes

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