Corrected the get_started.md example inference

[kazet]

It did not contain the checkpoint download step.

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #4429 (dc4728c) into master (1f04bc5) will increase coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4429      +/-   ##
==========================================
+ Coverage   61.80%   61.92%   +0.12%     
==========================================
  Files         239      239              
  Lines       18271    18271              
  Branches     3061     3061              
==========================================
+ Hits        11292    11315      +23     
+ Misses       6430     6406      -24     
- Partials      549      550       +1     

Flag	Coverage Δ
unittests	61.89% <ø> (+0.12%)	⬆️

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

Impacted Files	Coverage Δ
mmdet/models/roi_heads/mask_heads/maskiou_head.py	100.00% <0.00%> (+5.37%)	⬆️
mmdet/models/roi_heads/mask_scoring_roi_head.py	87.50% <0.00%> (+32.14%)	⬆️

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[ZwwWayne]

Hi @kazet ,
Thanks for your kind contribution. Could you sign the CLA thus we could merge this PR?

[OpenMMLab-Assistant-007]

Hi!
@kazet
First of all, we want to express our gratitude for your significant PR in the OpenMMLab project. Your contribution is highly appreciated, and we are grateful for your efforts in helping improve this open-source project during your personal time. We believe that many developers will benefit from your PR.

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