[3.x] Support pages with more output file extensions (Documentation)

[emmadesilva]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (458a8ce) to head (f653146).

Additional details and impacted files

@@ Coverage Diff @@## v3/non-html-pages #2559 +/- ##
=====================================================
Coverage 100.00% 100.00% Complexity 1780 1780 =====================================================
Files 179 179 Lines 4470 4470 =====================================================
Hits 4470 4470 

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