Fix a confusing typo in subclassing error message

[arteam]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1953 into release/3.x will not change coverage.
The diff coverage is n/a.

@@              Coverage Diff               @@
##             release/3.x    #1953   +/-   ##
==============================================
  Coverage          85.76%   85.76%           
  Complexity          2542     2542           
==============================================
  Files                318      318           
  Lines               7209     7209           
  Branches             861      861           
==============================================
  Hits                6183     6183           
  Misses               810      810           
  Partials             216      216           

Impacted Files	Coverage Δ	Complexity Δ
...al/creation/bytebuddy/SubclassInjectionLoader.java	57.44% <ø> (ø)	6.00 <0.00> (ø)

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