Fixes #2273 : Add missing parenthesis to javadoc example

[mvitz]

Adds the missing parenthesis to the ArgumentMatcher javadoc example

Checklist

• Read the contributing guide
• PR should be motivated, i.e. what does it fix, why, and if relevant how
• If possible / relevant include an example in the description, that could help all readers
  including project members to get a better picture of the change
• Avoid other runtime dependencies
• Meaningful commit history ; intention is important please rebase your commit history so that each
  commit is meaningful and help the people that will explore a change in 2 years
• The pull request follows coding style
• Mention Fixes #<issue number> in the description if relevant
• At least one commit should mention Fixes #<issue number> if relevant

[TimvdLippe]

Thanks!

[codecov-commenter]

Codecov Report

Merging #2274 (f47120d) into release/3.x (c86fe04) will increase coverage by 0.01%.
The diff coverage is n/a.

@@                Coverage Diff                @@
##             release/3.x    #2274      +/-   ##
=================================================
+ Coverage          84.88%   84.89%   +0.01%     
- Complexity          2734     2736       +2     
=================================================
  Files                326      326              
  Lines               8342     8342              
  Branches             997      997              
=================================================
+ Hits                7081     7082       +1     
+ Misses               987      986       -1     
  Partials             274      274              

Impacted Files	Coverage Δ	Complexity Δ
...to/internal/util/concurrent/WeakConcurrentMap.java	39.36% <0.00%> (-2.13%)	11.00% <0.00%> (ø%)
...al/creation/bytebuddy/InlineBytecodeGenerator.java	84.71% <0.00%> (+0.43%)	39.00% <0.00%> (+1.00%)
...l/creation/bytebuddy/InlineByteBuddyMockMaker.java	69.71% <0.00%> (+0.57%)	51.00% <0.00%> (+1.00%)

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