Fixes #1211: Improve @deprecated JavaDoc

[ghost]

This pull request fixes #1211 by improving the @deprecated JavaDoc of Mockito.debug(), MockitoDebugger and MockitoDebugger.printInvocations(Object ... mocks) by adding the additional information on how to retrieve an actual instance of the MockitoDebugger interface.

[codecov-io]

Codecov Report

Merging #1214 into release/2.x will not change coverage.
The diff coverage is n/a.

@@              Coverage Diff               @@
##             release/2.x    #1214   +/-   ##
==============================================
  Coverage          87.32%   87.32%           
  Complexity          2304     2304           
==============================================
  Files                287      287           
  Lines               5855     5855           
  Branches             696      696           
==============================================
  Hits                5113     5113           
  Misses               555      555           
  Partials             187      187

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/org/mockito/Mockito.java	96.55% <ø> (ø)	39 <0> (ø)	⬇️

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