fix formatting in documentation after #681

[Nothing4You]

What do these changes do?

Fix docs formatting.

We should adjust the local docs generation to use the RTD theme, that will make it easier to spot this in the future.

Are there changes in behavior for the user?

no.

Related issue number

#681

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• Add a new news fragment to CHANGES.txt

[codecov]

Codecov Report

Merging #683 (82487ed) into master (0a64588) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #683   +/-   ##
=======================================
  Coverage   83.60%   83.60%           
=======================================
  Files          12       12           
  Lines        2049     2049           
  Branches      331      331           
=======================================
  Hits         1713     1713           
  Misses        266      266           
  Partials       70       70           

Flag	Coverage Δ
ubuntu-latest_3.7_mariadb-10.2	82.31% <ø> (ø)
ubuntu-latest_3.7_mariadb-10.3	82.31% <ø> (ø)
ubuntu-latest_3.7_mariadb-10.4	82.31% <ø> (ø)
ubuntu-latest_3.7_mariadb-10.5	82.31% <ø> (ø)
ubuntu-latest_3.7_mariadb-10.6	82.31% <ø> (ø)
ubuntu-latest_3.7_mariadb-10.7	82.31% <ø> (ø)
ubuntu-latest_3.7_mysql-5.7	83.21% <ø> (ø)
ubuntu-latest_3.8_mariadb-10.2	82.72% <ø> (ø)
ubuntu-latest_3.8_mariadb-10.3	82.72% <ø> (ø)
ubuntu-latest_3.8_mariadb-10.4	82.72% <ø> (ø)
ubuntu-latest_3.8_mariadb-10.5	82.72% <ø> (ø)
ubuntu-latest_3.8_mariadb-10.6	82.72% <ø> (ø)
ubuntu-latest_3.8_mariadb-10.7	82.72% <ø> (ø)
ubuntu-latest_3.8_mysql-5.7	83.60% <ø> (ø)
ubuntu-latest_3.9_mariadb-10.2	82.72% <ø> (ø)
ubuntu-latest_3.9_mariadb-10.3	82.72% <ø> (ø)
ubuntu-latest_3.9_mariadb-10.4	82.72% <ø> (ø)
ubuntu-latest_3.9_mariadb-10.5	82.72% <ø> (ø)
ubuntu-latest_3.9_mariadb-10.6	82.72% <ø> (ø)
ubuntu-latest_3.9_mariadb-10.7	82.72% <ø> (ø)
ubuntu-latest_3.9_mysql-5.7	83.60% <ø> (ø)

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