fix RTM_CONNECTION_OPENED name in docs

[Pritilender]

Summary

Change RTM_CONNECTINO_OPENED event name in docs. #446 only fixes this in Readme file, but not in the docs.

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

Merging #469 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #469   +/-   ##
=======================================
  Coverage   89.12%   89.12%           
=======================================
  Files          44       44           
  Lines        1260     1260           
  Branches      190      190           
=======================================
  Hits         1123     1123           
  Misses        137      137

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