docs: add literal_rule to tagfiles

[alandefreitas]

No description provided.

[cppalliance-bot]

An automated preview of the documentation is available at https://891.url.prtest2.cppalliance.org/index.html

[cppalliance-bot]

GCOVR code coverage report https://891.url.prtest2.cppalliance.org/gcovr/index.html
LCOV code coverage report https://891.url.prtest2.cppalliance.org/genhtml/index.html
Coverage Diff https://891.url.prtest2.cppalliance.org/gcovr/coverage_diff.txt

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.20%. Comparing base (2fd73d3) to head (01c8fdd).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #891   +/-   ##
========================================
  Coverage    99.20%   99.20%           
========================================
  Files          157      157           
  Lines         8415     8415           
========================================
  Hits          8348     8348           
  Misses          67       67           

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