Merge pull request #345 from avlitman/deprecate-runbook

deprecate SingleStackIPv6Unsupported runbook

Author: sradco

…s/runbooks/SingleStackIPv6Unsupported.md …d_runbooks/SingleStackIPv6Unsupported.mddocs/runbooks/SingleStackIPv6Unsupported.md renamed to docs/deprecated_runbooks/SingleStackIPv6Unsupported.md docs/runbooks/SingleStackIPv6Unsupported.md renamed to docs/deprecated_runbooks/SingleStackIPv6Unsupported.md

@@ -1,4 +1,7 @@
-# SingleStackIPv6Unsupported
+# SingleStackIPv6Unsupported [Deprecated]
+
+This alert has been deprecated; it does not indicate a genuine issue. If
+triggered, it may be safely ignored and silenced.
 
 ## Meaning