[DOCS] Adds tagged region for notable breaking changes #10654
Merged
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This PR adds a tagged region in the Logstash Reference > Breaking Changes page (https://www.elastic.co/guide/en/logstash/master/breaking-changes.html), such that content can be re-used in the Installation and Upgrade Guide (https://www.elastic.co/guide/en/elastic-stack/master/elastic-stack-breaking-changes.html).
At least one tagged region must exist to prevent build errors in the Installation and Upgrade Guide, though as is the case now for V8.0.0 it can be an empty tagged region.
At this time, the Installation and Upgrade Guide for version X only lists the breaking changes specific to that version. If this Logstash page will contain information about multiple versions, we either need to (1) ensure that only the items that are specific to the appropriate version are tagged as "notable" in each branch, or (2) make the tagged regions version-specific (e.g. tag::notable-v8-breaking-changes[]). I'm open to whichever implementation is easier for you to maintain.
Related to elastic/stack-docs#271 and elastic/docs#791