[Refactor] Fix spelling

[fanqiNO1]

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Motivation

Spelling error.

Modification

Fix spelling. Change reprodcue to reproduce. Change babckone to backbone. Change Defaluts to Defaults.

BC-breaking (Optional)

Does the modification introduce changes that break the backward compatibility of the downstream repositories?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

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

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.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (test-1.0@4dd8a86). Click here to learn what that means.
Patch has no changes to coverable lines.

❗ Current head c9ba0d4 differs from pull request most recent head cadd0f4. Consider uploading reports for the commit cadd0f4 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##             test-1.0    #1681   +/-   ##
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  Coverage            ?   65.53%           
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  Files               ?      330           
  Lines               ?    25669           
  Branches            ?     4088           
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  Hits                ?    16823           
  Misses              ?     8229           
  Partials            ?      617           

Flag	Coverage Δ
unittests	65.53% <0.00%> (?)

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