Fix outdated connector documentation

[HalflingWizard]

Description

I tried to fix the outdated Document issue. this is my first serious contribution. I'm not totally sure if I did it right.

Fixes #1423

Status

READY

Type of change

• Documentation (fix or adds documentation)

How Has This Been Tested?

I didn't test, I just changed the doc according to opsdroid.connector.init.py

[codecov]

Codecov Report

Merging #1461 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1461   +/-   ##
=======================================
  Coverage   99.90%   99.90%           
=======================================
  Files          52       52           
  Lines        3168     3168           
=======================================
  Hits         3165     3165           
  Misses          3        3           

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[FabioRosado]

This is a great work! Thank you so much @iammamad for taking the time to fix this issue with our docs!