add prdoc and some fixes

cumulus/client/network/src/tests.rs

@@ -315,7 +315,7 @@ impl RelayChainInterface for DummyRelayChainInterface {
 			impl_version: 0,
 			apis: Cow::Owned(apis),
 			transaction_version: 5,
-			state_version: 1,
+			system_version: 1,
 		})
 	}
 }

cumulus/client/pov-recovery/src/tests.rs

@@ -327,7 +327,7 @@ impl RelayChainInterface for Relaychain {
 			impl_version: 0,
 			apis: Cow::Owned(apis),
 			transaction_version: 5,
-			state_version: 1,
+			system_version: 1,
 		})
 	}
 

docs/sdk/src/reference_docs/chain_spec_runtime/src/runtime.rs

@@ -48,7 +48,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	impl_version: 1,
 	apis: RUNTIME_API_VERSIONS,
 	transaction_version: 1,
-	state_version: 1,
+	system_version: 1,
 };
 
 /// The signed extensions that are added to the runtime.

prdoc/pr_4257.prdoc

@@ -0,0 +1,21 @@
+# Schema: Polkadot SDK PRDoc Schema (prdoc) v1.0.0
+# See doc at https://raw.githubusercontent.com/paritytech/polkadot-sdk/master/prdoc/schema_user.json
+
+title: Rename `state_version` in `RuntimeVersion` to `system_version`.
+
+doc:
+  - audience: Runtime Dev
+    description: |
+      This PR renames `state_version` in `RuntimeVersion` to `system_version`. `system_version=2` signifies
+      that extrinsic root derivation uses `StateVersion::V1`.
+
+  - audience: Runtime User
+    description: |
+      `RuntimeVersion`'s `state_version` is renames to `system_version`. Applications using that type and its field
+      must update their code to reflect the changes
+
+crates:
+  - name: frame-system
+    bump: minor
+  - name: sp-version
+    bump: minor