Remove extra notable-breaking-changes tag in docs.

docs/migration/migrate_8_0.asciidoc

@@ -17,6 +17,7 @@ See also <<whats-new>> and <<release-notes>>.
 //NOTE: The notable-breaking-changes tagged regions are re-used in the
 //Installation and Upgrade Guide
 
+// tag::notable-breaking-changes[]
 [float]
 [[breaking_80_index_pattern_changes]]
 === Index pattern changes
@@ -30,19 +31,16 @@ to function as expected. Support for these index patterns has been removed in 8.
 *Impact:* You must migrate your time_based index patterns to a wildcard pattern,
 for example, `logstash-*`.
 
-
 [float]
 [[breaking_80_setting_changes]]
 === Settings changes
 
-// tag::notable-breaking-changes[]
 [float]
 ==== Multitenancy by changing `kibana.index` is no longer supported
 *Details:* `kibana.index`, `xpack.reporting.index` and `xpack.task_manager.index` can no longer be specified. 
 
 *Impact:* Users who relied on changing these settings to achieve multitenancy should use *Spaces*, cross-cluster replication, or cross-cluster search instead. To migrate to *Spaces*, users are encouraged to use saved object management to export their saved objects from a tenant into the default tenant in a space. Improvements are planned to improve on this workflow. See https://github.com/elastic/kibana/issues/82020 for more details.   
 
-// tag::notable-breaking-changes[]
 [float]
 ==== Disabling most plugins with the `{plugin_name}.enabled` setting is no longer supported
 *Details:* The ability for most plugins to be disabled using the `{plugin_name}.enabled` config option has been removed.