[DOCS] title clarification in Results page

[romesco]

What does this PR do?

Clarifies that test loop is equivalent to validation loop in terms of return objects.

Fixes #1936

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[codecov]

Codecov Report

Merging #2827 into master will increase coverage by 31%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master   #2827     +/-   ##
========================================
+ Coverage      59%     90%    +31%     
========================================
  Files          78      78             
  Lines        6918    6921      +3     
========================================
+ Hits         4071    6238   +2167     
+ Misses       2847     683   -2164     

[mergify]

Great job! =)