docs(notifications): reduce confusion

[ManfredLiuSolera]

I'd suggest to use the same configmap and secrets name in the yaml example. and the channel name is variable.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.53%. Comparing base (1600c03) to head (27eafd7).
Report is 1518 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #16440   +/-   ##
=======================================
  Coverage   49.53%   49.53%           
=======================================
  Files         269      269           
  Lines       47222    47222           
=======================================
  Hits        23392    23392           
  Misses      21530    21530           
  Partials     2300     2300           

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[blakepettersson]

I think the docs change actually needs to be done in notifications-engine first 😢

see https://github.com/argoproj/notifications-engine/blob/84b9f79136041bf0d6854c151b5bbad031c4b053/docs/services/teams.md

[pasha-codefresh]

@ManfredLiuSolera could you please open PR with this change inside notification-engine ?

[blakepettersson]

Marking as draft for now until a corresponding PR has been opened in notifications-engine