[Docs] Mismatching results in documentation

[FeatureSpitter]

The doc issue

In this documentation (https://mmaction2.readthedocs.io/en/latest/get_started/quick_run.html), the example shows the label within the video making it look as if it is a post-processing overlay encoded by mmaction2:

But in reality the created overlay is incomplete. Actual result:

Reproduction steps are just following this https://mmaction2.readthedocs.io/en/latest/get_started/installation.html and then try the command from https://mmaction2.readthedocs.io/en/latest/get_started/quick_run.html#inference

Suggest a potential alternative/fix

No response