doc: add metadata to report docs

Fixes: #25682

PR-URL: #25708
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

Author: richardlau

doc/api/report.md

@@ -1,5 +1,12 @@
 # Diagnostic Report
 
+<!--introduced_in=v11.8.0-->
+<!-- type=misc -->
+
+> Stability: 1 - Experimental
+
+<!-- name=report -->
+
 Delivers a JSON-formatted diagnostic summary, written to a file.
 
 The report is intended for development, test and production use, to capture