Docs fix regex formatting

[mpoemsl]

Description

Without backticks, the * in the allowed_urls regex is not rendered, which can lead to confusion. This PR adds backticks.

Type of change

Please delete options that are not relevant.

• This change requires a documentation update

Checklist:

• Did you have fun?
• Have you made corresponding changes to the documentation?

[codecov]

Codecov Report

Merging #2172 (22708dd) into master (82acbbf) will increase coverage by 0.06%.
The diff coverage is n/a.

❗ Current head 22708dd differs from pull request most recent head 72d5bd3. Consider uploading reports for the commit 72d5bd3 to get more accurate results

@@            Coverage Diff             @@
##           master    #2172      +/-   ##
==========================================
+ Coverage   71.38%   71.45%   +0.06%     
==========================================
  Files          73       73              
  Lines        3296     3296              
  Branches       57       57              
==========================================
+ Hits         2353     2355       +2     
+ Misses        943      941       -2     

see 2 files with indirect coverage changes

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