[Improvement] Rename lr modules to scheduler

[dreamerlin]

No description provided.

[codecov]

Codecov Report

Merging #916 (3f5af8e) into master (f8b595a) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #916      +/-   ##
==========================================
- Coverage   83.57%   83.54%   -0.04%     
==========================================
  Files         132      132              
  Lines        9966     9966              
  Branches     1718     1718              
==========================================
- Hits         8329     8326       -3     
- Misses       1218     1222       +4     
+ Partials      419      418       -1     

Flag	Coverage Δ
unittests	83.54% <100.00%> (-0.04%)	⬇️

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Impacted Files	Coverage Δ
mmaction/core/__init__.py	100.00% <100.00%> (ø)
mmaction/core/scheduler/__init__.py	100.00% <100.00%> (ø)
mmaction/core/scheduler/lr_updater.py	96.55% <100.00%> (ø)
mmaction/datasets/pipelines/augmentations.py	92.29% <0.00%> (-0.35%)	⬇️

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[kennymckormick]

Please also replace the '.lr' to '.scheduler' in api.rst