fix: No job concurrency for docs wf

[cicdguy]

Otherwise other jobs will get canceled.

[github-actions]

Code Coverage Summary

Filename      Stmts    Miss  Cover    Missing
----------  -------  ------  -------  ---------
R/hello.R        20       6  70.00%   55-60
TOTAL            20       6  70.00%

Diff against main

Filename      Stmts    Miss  Cover
----------  -------  ------  --------
TOTAL             0       0  +100.00%

Results for commit: 3cb5e53

Minimum allowed coverage is 80%

♻️ This comment has been updated with latest results

[github-actions]

Unit Tests Summary

3 tests   3 ✅  6s ⏱️
3 suites  0 💤
1 files    0 ❌

Results for commit 3cb5e53.