[Docs] Update Docs in RTMPose

[Zheng-LinXiao]

1. Modify the table in major features
2. Modify the introduction in Pre-compiled MMDeloy SDK

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.04 🎉

Comparison is base (acf6c58) 81.79% compared to head (a21282e) 81.83%.

❗ Current head a21282e differs from pull request most recent head fc5703e. Consider uploading reports for the commit fc5703e to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #2057      +/-   ##
===========================================
+ Coverage    81.79%   81.83%   +0.04%     
===========================================
  Files          227      227              
  Lines        13440    13440              
  Branches      2285     2285              
===========================================
+ Hits         10993    10999       +6     
+ Misses        1931     1924       -7     
- Partials       516      517       +1     

Flag	Coverage Δ
unittests	81.83% <ø> (+0.04%)	⬆️

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see 2 files with indirect coverage changes

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