[Docs] Update weight initialization in cnn.md

[zhouzaida]

No description provided.

[codecov]

Codecov Report

Merging #912 (aac4aab) into master (9b8dd08) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #912   +/-   ##
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  Coverage   65.01%   65.01%           
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  Files         154      154           
  Lines        9893     9893           
  Branches     1801     1801           
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  Hits         6432     6432           
  Misses       3127     3127           
  Partials      334      334           

Flag	Coverage Δ
unittests	65.01% <ø> (ø)

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Impacted Files	Coverage Δ
mmcv/cnn/utils/weight_init.py	91.89% <ø> (ø)

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[MeowZheng]

base on weight initialization design , users must give values for layer or override.

[MeowZheng]

should we give some explanations for sequential or modulelist? ref:#884

[zhouzaida]

should we give some explanations for sequential or modulelist? ref:#884

yep, but maybe we should firstly add doc for sequential or modulelist.

[zhouzaida]

ping @MeowZheng

[MeowZheng]

init_weight has been renamed to init_weights ref #971

[MeowZheng]

Many thanks for your nice work. It looks good to me.