[Docs] Fix Chinese docs whitespaces

[C1rN09]

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Motivation

Fix Chinese docs whitespaces caused by HTML specification. See #486

Modification

• Add a pre-commit-hook to remove end_of_line characters that split natural Chinese paragraphs
• Fix all docs related

BC-breaking (Optional)

No

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here, and update the documentation.

Checklist

• Pre-commit or other linting tools are used to fix the potential lint issues.
• The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• If the modification has potential influence on downstream projects, this PR should be tested with downstream projects, like MMDet or MMCls.
• The documentation has been modified accordingly, like docstring or example tutorials.

[codecov]

Codecov Report

Base: 78.10% // Head: 77.81% // Decreases project coverage by -0.29% ⚠️

Coverage data is based on head (45780f0) compared to base (a6e1259).
Patch has no changes to coverable lines.

❗ Current head 45780f0 differs from pull request most recent head 9b5067e. Consider uploading reports for the commit 9b5067e to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #521      +/-   ##
==========================================
- Coverage   78.10%   77.81%   -0.30%     
==========================================
  Files         126      116      -10     
  Lines        9039     8608     -431     
  Branches     1800     1777      -23     
==========================================
- Hits         7060     6698     -362     
+ Misses       1666     1610      -56     
+ Partials      313      300      -13     

Flag	Coverage Δ
unittests	77.81% <ø> (-0.30%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmengine/model/utils.py	59.75% <0.00%> (-3.71%)	⬇️
mmengine/model/wrappers/__init__.py	66.66% <0.00%> (-3.34%)	⬇️
mmengine/model/base_model/base_model.py	83.33% <0.00%> (-2.97%)	⬇️
mmengine/model/wrappers/distributed.py	48.57% <0.00%> (-2.95%)	⬇️
mmengine/utils/dl_utils/collect_env.py	44.44% <0.00%> (-0.77%)	⬇️
mmengine/runner/checkpoint.py	44.00% <0.00%> (-0.64%)	⬇️
mmengine/hooks/checkpoint_hook.py	89.83% <0.00%> (-0.47%)	⬇️
mmengine/hooks/logger_hook.py	98.70% <0.00%> (-0.14%)	⬇️
mmengine/model/__init__.py	75.00% <0.00%> (ø)
mmengine/fileio/__init__.py	100.00% <0.00%> (ø)
... and 24 more

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[zhouzaida]

This is a useful script and it can also be applied in other OpenMMLab projects so we can add it to https://github.com/open-mmlab/pre-commit-hooks.

[zhouzaida]

open-mmlab/pre-commit-hooks#12 had been merged.
Please update .pre-commit-config.yaml and .pre-commit-config-zh-cn.yaml accordingly.