Add a small note about the trailing slash for the OnCall Integration
URL.
# What this PR does
A user contacted Support because they were confused by the need for a
trailing slash for the alertmanager oncall integration url. This PR is
an attempt to briefly call out the trailing slash is required in an
effort to prevent user confusion in the future.
## Which issue(s) this PR fixes
## Checklist
- [ ] Unit, integration, and e2e (if applicable) tests updated
- [ ] Documentation added (or `pr:no public docs` PR label added if not
required)
- [ ] `CHANGELOG.md` updated (or `pr:no changelog` PR label added if not
required)
---------
Co-authored-by: Ildar Iskhakov <Ildar.iskhakov@grafana.com>
Co-authored-by: GitHub Actions <actions@github.com>
Co-authored-by: Vadim Stepanov <vadimkerr@gmail.com>
Co-authored-by: mallettjared <110853992+mallettjared@users.noreply.github.com>
Co-authored-by: Joey Orlando <joey.orlando@grafana.com>
Co-authored-by: Wei-Chin Call <wei-chin.call@grafana.com>
Co-authored-by: Joey Orlando <joseph.t.orlando@gmail.com>
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