Remove italics from "Models" section header

[adamchainz]

Description of the Change

Single quotes are italics in reST and I see no need for them in this particular heading.

Checklist

• PR only contains one change (considered splitting up PR)
• [n/a] unit-test added
• documentation updated
• [n/a] CHANGELOG.md updated (only for user relevant changes)
• [n/a] author name in AUTHORS

[codecov]

Codecov Report

Merging #927 (b9fd374) into master (e3207d8) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #927   +/-   ##
=======================================
  Coverage   94.94%   94.94%           
=======================================
  Files          30       30           
  Lines        1423     1423           
=======================================
  Hits         1351     1351           
  Misses         72       72           

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[n2ygk]

Thanks!