github newrelic/docs-website release-10.08.2021-17.26

🚀 What's new?

@founddrama - docs(Alerts): updates Alerts NerdGraph docs for notificationChannels ->
@founddrama - docs(Alerts): add NerdGraph example for searching Alert Policies by name ->
@rhetoric101 - Merge pull request #4250 from founddrama/docs/fix-policies-nerdgraph ->
@rhetoric101 - Merge pull request #4249 from founddrama/docs/update-alert-notification-channels ->

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