Fix typo in CONTRIBUTING.md and SpyOnInjectedFieldsHandler

[0xh3xa]

Fix typo in CONTRIBUTING.md and SpyOnInjectedFieldsHandler.java

[codecov-commenter]

Codecov Report

Merging #1994 into release/3.x will not change coverage.
The diff coverage is n/a.

@@              Coverage Diff               @@
##             release/3.x    #1994   +/-   ##
==============================================
  Coverage          85.23%   85.23%           
  Complexity          2604     2604           
==============================================
  Files                323      323           
  Lines               7520     7520           
  Branches             899      899           
==============================================
  Hits                6410     6410           
  Misses               873      873           
  Partials             237      237           

Impacted Files	Coverage Δ	Complexity Δ
...guration/injection/SpyOnInjectedFieldsHandler.java	83.33% <ø> (ø)	4.00 <0.00> (ø)

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[TimvdLippe]

Thanks!