[Fix] Fix README in the example_project

[zzc98]

Motivation

Fix README in the example_project.

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

Patch and project coverage have no change.

Comparison is base (f9dcae2) 68.16% compared to head (15f30ab) 68.17%.

❗ Current head 15f30ab differs from pull request most recent head fb771ab. Consider uploading reports for the commit fb771ab to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1575   +/-   ##
=======================================
  Coverage   68.16%   68.17%           
=======================================
  Files         295      295           
  Lines       23372    23372           
  Branches     3713     3713           
=======================================
+ Hits        15932    15933    +1     
  Misses       6880     6880           
+ Partials      560      559    -1     

Flag	Coverage Δ
unittests	68.17% <ø> (+<0.01%)	⬆️

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see 1 file with indirect coverage changes

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