Fixing word tense

[adityashukzy]

Changing "defined" to "defines" in keeping with the convention of using present tense in comments.

What does this PR do?

Fixes word tense; increases clarity. Changed "defined" to "defines" in keeping with the convention of present tense while writing comments in code.

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[codecov]

Codecov Report

Merging #6974 (98d4797) into master (6c01608) will decrease coverage by 5%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #6974    +/-   ##
=======================================
- Coverage      92%     86%    -5%     
=======================================
  Files         194     194            
  Lines       12368   12368            
=======================================
- Hits        11324   10697   -627     
- Misses       1044    1671   +627