docs: fix whitespace in CONTRIBUTING.md

[ST-DDT]

Extracted from #2949

• feat: add book module #2949

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.95%. Comparing base (75841a5) to head (02d722d).

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #2955   +/-   ##
=======================================
  Coverage   99.95%   99.95%           
=======================================
  Files        2987     2987           
  Lines      216052   216052           
  Branches      951      952    +1     
=======================================
+ Hits       215954   215962    +8     
+ Misses         98       90    -8     

see 2 files with indirect coverage changes