Fix typo in README.md of Strong Baselines

[Keiku]

Thanks for your contribution and we appreciate it a lot. The following instructions would make your pull request more healthy and more easily get feedback. If you do not understand some items, don't worry, just make the pull request and seek help from maintainers.

Motivation

Fix typo in README.md of Strong Baselines.

Modification

Fixed large-scale "jittor" to large-scale jitter.

Checklist

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

[CLAassistant]

All committers have signed the CLA.

[BIGWangYuDong]

LGTM

[codecov]

Codecov Report

Merging #6865 (93a0cc1) into dev-v2.20.0 (1efcc0a) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           dev-v2.20.0    #6865      +/-   ##
===============================================
- Coverage        62.02%   62.01%   -0.02%     
===============================================
  Files              323      323              
  Lines            25744    25744              
  Branches          4363     4363              
===============================================
- Hits             15969    15964       -5     
- Misses            8928     8931       +3     
- Partials           847      849       +2     

Flag	Coverage Δ
unittests	61.99% <ø> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
mmdet/core/bbox/samplers/random_sampler.py	75.00% <0.00%> (-5.56%)	⬇️
mmdet/models/dense_heads/base_dense_head.py	88.70% <0.00%> (-1.70%)	⬇️

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[BIGWangYuDong]

@Keiku Please sign the CLA.

[Keiku]

@BIGWangYuDong Sorry I'm late. I think I was able to do CLA.

[BIGWangYuDong]

@BIGWangYuDong Sorry I'm late. I think I was able to do CLA.

Thanks!