Add prdoc

Author: github-actions[bot]

prdoc/pr_9868.prdoc

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+title: Fix the deadlock during statements gossiping
+doc:
+- audience: Node Dev
+  description: |-
+    During high load the statement store experiences deadlock-like behavior: every second statements were gossiping, locking the index which possibly caused the deadlock. After the fix, the observed behavior no longer occurs.
+
+crates:
+- name: sc-statement-store
+  bump: patch