[Docs] Add inheritance design explanation to Config Tutorial

[dreamerlin]

No description provided.

[codecov]

Codecov Report

Merging #572 (dfbf085) into master (4240105) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #572      +/-   ##
==========================================
- Coverage   84.17%   84.12%   -0.05%     
==========================================
  Files         121      121              
  Lines        8613     8613              
  Branches     1427     1427              
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- Hits         7250     7246       -4     
- Misses       1014     1017       +3     
- Partials      349      350       +1     

Flag	Coverage Δ
unittests	84.12% <ø> (-0.04%)	⬇️

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Impacted Files	Coverage Δ
mmaction/datasets/pipelines/augmentations.py	94.31% <0.00%> (-0.51%)	⬇️

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[innerlee]

Why use FastRCNN as example?

Okay fine, but FastRCNN is only a part of the model, right?

[dreamerlin]

Why use FastRCNN as example?

Okay fine, but FastRCNN is only a part of the model, right?

yeah, spatial temporal detection model is based on FastRCNN but with SlowFast backbone