[DOC] Refine Inference Doc

[Ezra-Yu]

Motivation

as title. not include the ImageRetrievalInferencer

Checklist

Before PR:

• Pre-commit or other linting tools are used to fix the potential lint issues.
• Bug fixes are fully covered by unit tests, the case that causes the bug should be added in the unit tests.
• The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, like docstring or example tutorials.

After PR:

• If the modification has potential influence on downstream or other related projects, this PR should be tested with those projects, like MMDet or MMSeg.
• CLA has been signed and all committers have signed the CLA in this PR.

[fangyixiao18]

Chinese version?

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.84 🎉

Comparison is base (c9a0cb0) 84.37% compared to head (9f64af8) 85.21%.

❗ Current head 9f64af8 differs from pull request most recent head e1761bb. Consider uploading reports for the commit e1761bb to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1489      +/-   ##
==========================================
+ Coverage   84.37%   85.21%   +0.84%     
==========================================
  Files         142      239      +97     
  Lines        9925    17949    +8024     
  Branches     1621     2802    +1181     
==========================================
+ Hits         8374    15296    +6922     
- Misses       1277     2133     +856     
- Partials      274      520     +246     

Flag	Coverage Δ
unittests	85.21% <ø> (+0.84%)	⬆️

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see 381 files with indirect coverage changes

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[fangyixiao18]

the output of pred_class is Chinese?