Fix typo in CONTRIBUTING.md

[eltociear]

formating -> formatting

[codecov]

Codecov Report

Merging #5167 (7be0134) into master (e37968a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5167   +/-   ##
=======================================
  Coverage   74.99%   74.99%           
=======================================
  Files         618      618           
  Lines       55588    55588           
=======================================
  Hits        41689    41689           
  Misses      13899    13899           

Flag	Coverage Δ
test_integration_espnet1	66.28% <ø> (ø)
test_integration_espnet2	47.61% <ø> (ø)
test_python	65.45% <ø> (ø)
test_utils	23.28% <ø> (ø)

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