Fix LT-22633

[AndyBlack]

We have two places where we display information in a web browser. We allow users to invoke a Find dialog so they can more easily find what they are looking for. There were two places where invoking the Find dilaog could cause a crash. The reporter for LT-22633 found one of them.

The fix in GeneratedHtmlViewer.cs is for the case the reporter found.

The fix in TryAWordDlg.cs is for the other case I found. The simplest solution for it is to only allow the user to invoke the Find dialog when TryAWord is showing a parsing result page. There is no need to let the user look for something with either the initial message page or the while trrying page.

There was a typo in the InitialDocument.htm title which is fixed (not that this is crucial...).

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This change is 

[github-actions]

NUnit Tests

    1 files  ±0      1 suites  ±0   10m 21s ⏱️ -48s
4 313 tests ±0  4 240 ✅ ±0  73 💤 ±0  0 ❌ ±0 
4 322 runs  ±0  4 249 ✅ ±0  73 💤 ±0  0 ❌ ±0 

Results for commit 2ab6dbe. ± Comparison against base commit 7176e6c.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 33.02%. Comparing base (7176e6c) to head (2ab6dbe).

Files with missing lines	Patch %	Lines
Src/xWorks/GeneratedHtmlViewer.cs	0.00%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1025      +/-   ##
==========================================
- Coverage   33.02%   33.02%   -0.01%     
==========================================
  Files        1202     1202              
  Lines      278232   278236       +4     
  Branches    37169    37170       +1     
==========================================
- Hits        91889    91881       -8     
- Misses     158495   158505      +10     
- Partials    27848    27850       +2     

Files with missing lines	Coverage Δ
Src/xWorks/GeneratedHtmlViewer.cs	0.00% <0.00%> (ø)

... and 3 files with indirect coverage changes

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[thejambi]

Changes look good!

@thejambi reviewed 3 files and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on AndyBlack).