Closes #10782: Update crash reporting doc with what information breadcrumbs are recording

[rocketsroger]

Pull Request checklist

• Tests: This PR includes thorough tests or an explanation of why it does not
• Screenshots: This PR includes screenshots or GIFs of the changes made or an explanation of why it does not
• Accessibility: The code in this PR follows accessibility best practices or does not include any user facing features. In addition, it includes a screenshot of a successful accessibility scan to ensure no new defects are added to the product.

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[codecov-commenter]

Codecov Report

Merging #10787 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master   #10787   +/-   ##
=========================================
  Coverage     19.18%   19.18%           
  Complexity      600      600           
=========================================
  Files           360      360           
  Lines         14821    14821           
  Branches       2011     2011           
=========================================
  Hits           2843     2843           
  Misses        11718    11718           
  Partials        260      260           

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[liuche]

Also linking to data review bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1635932

Couldn't find where the breadcrumb code was originally added, but this is now in BreadcrumbRecorder.kt

[liuche]

"and whether it is a custom tab" (to make it clear it's a boolean)

[rocketsroger]

Thanks, I'll fix.

[liuche]

(in the future, you don't need to file the data review in bugzilla, but can just include it in the PR, like #10785 - that will keep all this documentation/code changes together so it's easy to find in the future)