prdoc: Copy paster pr doc

Signed-off-by: Alexandru Vasile <[email protected]>

prdoc/pr_6676.prdoc

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+title: Expose the unstable metadata v16
+doc:
+- audience: Node Dev
+  description: |
+    This PR exposes the *unstable* metadata V16. The metadata is exposed under the unstable u32::MAX number.
+    Developers can start experimenting with the new features of the metadata v16. *Please note that this metadata is under development and expect breaking changes until stabilization.*
+    The `ExtrinsicMetadata` trait receives a breaking change. Its associated type `VERSION` is rename to `VERSIONS` and now supports a constant static list of metadata versions.
+    The versions implemented for `UncheckedExtrinsic` are v4 (legacy version) and v5 (new version).
+    For metadata collection, it is assumed that all `TransactionExtensions` are under version 0.
+
+crates:
+  - name: sp-metadata-ir
+    bump: major
+  - name: frame-support-procedural
+    bump: patch
+  - name: frame-support
+    bump: minor
+  - name: frame-support-test
+    bump: major
+  - name: frame-metadata-hash-extension
+    bump: patch
+  - name: substrate-wasm-builder
+    bump: minor
+  - name: pallet-revive
+    bump: minor
+  - name: sp-runtime
+    bump: major
+  - name: frame-benchmarking-cli
+    bump: patch