Update silences.md (#38834)

* Update silences.md

minor correction in not equals regex

* Update docs/sources/alerting/unified-alerting/silences.md

Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>

docs/sources/alerting/unified-alerting/silences.md

@@ -50,7 +50,7 @@ Grafana alerting UI supports managing external Alertmanager silences. Once you a
 
 ## Create a URL to silence form with defaults filled in
 
-When linking to silence form, you can provide default matching labels and comment via `matchers` and `comment` query parameters. `matchers` expects one more matching labels of type `[label][operator][value]` joined by a comma. `operator` can be one of `=` (equals, not regex), `!=` (not equals, not regex), `=~` (equals, regex), `!~` (not equals, not regex).
+When linking to a silence form, provide the default matching labels and comment via `matchers` and `comment` query parameters. The `matchers` parameter requires one more matching labels of the type `[label][operator][value]` joined by a comma while the `operator` parameter can be one of  the following: `=` (equals, not regex), `!=` (not equals, not regex), `=~` (equals, regex), `!~` (not equals, regex).
 
 For example, to link to silence form with matching labels `severity=critical` & `cluster!~europe-.*` and comment `Silence critical EU alerts`, create a URL `https://mygrafana/aleting/silence/new?matchers=severity%3Dcritical%2Ccluster!~europe-*&comment=Silence%20critical%20EU%20alert`.