Fix/convert enrichment

[dpvc]

This PR fixes some comment typos, and makes sure that the SRE options are in place if a conversion action is taken before the page is typeset. E.g., if MathJax.tex2chtml() or doc.convert() is called from a command-line application that just converts math strings without processing a page as a whole.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.93%. Comparing base (a8088bb) to head (2baf52d).

Additional details and impacted files

@@            Coverage Diff             @@
##           develop    #1537     +/-   ##
==========================================
  Coverage    86.93%   86.93%             
==========================================
  Files          388      388             
  Lines        87571    87573      +2     
  Branches      3290     4967   +1677     
==========================================
+ Hits         76129    76131      +2     
  Misses       11442    11442             

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[dpvc]

I removed the commit for the asyncLoad() change as I already have it in another branch whose PR will be made shortly.