fixed typo which caused incorrect display of code block

[hamza-jutt]

Description of the Change

Fixed a typo in documentation which was causing the viewer to misbehave for .rst file.

Checklist

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

[n2ygk]

Thanks for this.

[codecov]

Codecov Report

Merging #1172 (6ca7d60) into master (155bef3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1172   +/-   ##
=======================================
  Coverage   96.90%   96.90%           
=======================================
  Files          31       31           
  Lines        1812     1812           
=======================================
  Hits         1756     1756           
  Misses         56       56           

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