docs: add content to APM User guide (#6378) (#6476)

(cherry picked from commit d9a7812)

Co-authored-by: Brandon Morelli <[email protected]>

Author: mergify[bot]

docs/apm-breaking.asciidoc

@@ -8,6 +8,12 @@
 // (which might mean removing this entirely, or more likely, adding this content to headings in those notes)
 // fix all broken links once a new attribute is added
 
+// These tagged regions are required for the stack-docs repo includes
+// tag::notable-v8-breaking-changes[]
+// end::notable-v8-breaking-changes[]
+// tag::716-bc[]
+// end::716-bc[]
+
 [float]
 [[breaking-changes-7.15]]
 === 7.15

docs/apm-distributed-tracing.asciidoc

@@ -103,7 +103,7 @@ with each agent's API.
 Sending services must add the `traceparent` header to outgoing requests.
 
 --
-include::./tab-widgets/distributed-trace-send-widget.asciidoc[]
+include::./shared/distributed-trace-send/distributed-trace-send-widget.asciidoc[]
 --
 
 [float]
@@ -114,7 +114,7 @@ Receiving services must parse the incoming `traceparent` header,
 and start a new transaction or span as a child of the received context.
 
 --
-include::./tab-widgets/distributed-trace-receive-widget.asciidoc[]
+include::./shared/distributed-trace-receive/distributed-trace-receive-widget.asciidoc[]
 --
 
 [float]