Format the cocotb doc

[timkpaine]

The profile composition change left docs/src/cocotb.md unformatted, which fails the docs lint job.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.56%. Comparing base (643516a) to head (0ed35f6).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #50      +/-   ##
==========================================
- Coverage   84.61%   84.56%   -0.05%     
==========================================
  Files          56       60       +4     
  Lines        9347     9712     +365     
  Branches     1198     1240      +42     
==========================================
+ Hits         7909     8213     +304     
- Misses       1156     1198      +42     
- Partials      282      301      +19     

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