DOC fixes in contributing.rst

[jorisvandenbossche]

xref #15883

[codecov]

Codecov Report

Merging #15887 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #15887   +/-   ##
=======================================
  Coverage   90.97%   90.97%           
=======================================
  Files         145      145           
  Lines       49483    49483           
=======================================
  Hits        45015    45015           
  Misses       4468     4468

Flag	Coverage Δ
#multiple	88.73% <ø> (ø)	⬆️
#single	40.63% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
pandas/io/json/normalize.py	96.93% <ø> (ø)	⬆️
pandas/core/series.py	94.96% <ø> (ø)	⬆️

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[jreback]

thanks!