docs: fix code-block

[IndraGunawan]

Signed-off-by: Indra Gunawan indra@propertyguru.com.sg

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https://argo-cd.readthedocs.io/en/stable/operator-manual/notifications/services/slack/
before

after

[codecov]

Codecov Report

Merging #9874 (fa18344) into master (c1d8173) will decrease coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #9874      +/-   ##
==========================================
- Coverage   45.86%   45.73%   -0.14%     
==========================================
  Files         227      227              
  Lines       26864    26953      +89     
==========================================
+ Hits        12322    12327       +5     
- Misses      12862    12946      +84     
  Partials     1680     1680              

Impacted Files	Coverage Δ
cmd/argocd-k8s-auth/commands/aws.go	17.64% <0.00%> (-0.36%)	⬇️
cmd/argocd/commands/admin/settings_rbac.go	23.80% <0.00%> (-0.26%)	⬇️
cmd/argocd/commands/admin/project.go	27.97% <0.00%> (-0.20%)	⬇️
cmd/argocd/commands/cluster.go	8.97% <0.00%> (-0.20%)	⬇️
cmd/argocd/commands/app.go	20.00% <0.00%> (-0.15%)	⬇️
cmd/argocd/commands/admin/app.go	30.37% <0.00%> (-0.13%)	⬇️
cmd/argocd/commands/app_resources.go	8.47% <0.00%> (-0.08%)	⬇️
cmd/argocd/commands/gpg.go	0.00% <0.00%> (ø)
cmd/argocd/commands/cert.go	0.00% <0.00%> (ø)
cmd/argocd/commands/repo.go	0.00% <0.00%> (ø)
... and 15 more

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[crenshaw-dev]

@IndraGunawan thanks for the PR! Looks like this has to be fixed upstream. https://github.com/argoproj-labs/argocd-notifications/blob/master/docs/services/slack.md

[crenshaw-dev]

Closing for now to wait for the upstream change.

[omBratteng]

The source of those docs comes from https://github.com/argoproj/notifications-engine, and I have a PR open to fix the remaining codefence argoproj/notifications-engine#97