[tiny] Fix training_dataloader usage to be train_dataloader instead.

[vr140]

There are usages of training_dataloader, which is a method that no longer seems to exist in LightningModule. Instead, these usages should be updated to train_dataloader.

[codecov]

Codecov Report

Merging #2521 into master will increase coverage by 1%.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #2521   +/-   ##
======================================
+ Coverage      88%     89%   +1%     
======================================
  Files          69      69           
  Lines        5628    5628           
======================================
+ Hits         4963    5017   +54     
+ Misses        665     611   -54     

[Borda]

Good catch, thx

[awaelchli]

maybe one thing in the future we could do is with pytest.raises(..) also test for the specific message, not just the error/warning class.

[Borda]

maybe one thing in the future we could do is with pytest.raises(..) also test for the specific message, not just the error/warning class.

sure, this also simplifies finding what code block it is related...