docs: mention default notification templates

[kostis-codefresh]

Signed-off-by: Kostis Kapelonis [email protected]

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this is a chore.
• The title of the PR is (a) conventional, (b) states what changed, and (c) suffixes the related issues number. E.g. "fix(controller): Updates such and such. Fixes #1234".
• I've signed my commits with DCO
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My builds are green. Try syncing with master if they are not.
• My organization is added to USERS.md.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov]

Codecov Report

Merging #1725 (8c06745) into master (5b140c9) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1725   +/-   ##
=======================================
  Coverage   82.02%   82.02%           
=======================================
  Files         116      116           
  Lines       16096    16096           
=======================================
  Hits        13203    13203           
  Misses       2218     2218           
  Partials      675      675           

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