Correct failure-change notification mode

[KBalderson]

Summary

The documentation for the configuration option to notify on failure or once on success was incorrect. I updated it to reflect the correct value to supply for the notificationMode option.

Test plan

N/A - Docs only.

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[codecov-io]

Codecov Report

Merging #6878 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #6878   +/-   ##
=======================================
  Coverage   66.98%   66.98%           
=======================================
  Files         250      250           
  Lines       10358    10358           
  Branches        3        3           
=======================================
  Hits         6938     6938           
  Misses       3419     3419           
  Partials        1        1

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[SimenB]

Thanks! Could you update the versioned docs as well?

[SimenB]

Awesome, thanks!

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