Fix RPC names in rustdocs

Two structs had incorrect RPC names in their rustdocs.

Correct them.

Author: jamillambert

types/src/model/blockchain.rs

@@ -520,7 +520,7 @@ pub struct GetMempoolAncestors(pub Vec<Txid>);
 #[serde(deny_unknown_fields)]
 pub struct GetMempoolAncestorsVerbose(pub BTreeMap<Txid, MempoolEntry>);
 
-/// Models the result of JSON-RPC method `getmempoolancestors` with verbose set to false.
+/// Models the result of JSON-RPC method `getmempooldescendants` with verbose set to false.
 #[derive(Clone, Debug, PartialEq, Deserialize, Serialize)]
 #[serde(deny_unknown_fields)]
 pub struct GetMempoolDescendants(pub Vec<Txid>);

types/src/v17/blockchain/mod.rs

@@ -602,7 +602,7 @@ pub struct GetMempoolInfo {
 #[serde(deny_unknown_fields)]
 pub struct GetRawMempool(pub Vec<String>);
 
-/// Result of JSON-RPC method `getmempooldescendants` with verbose set to `true`.
+/// Result of JSON-RPC method `getrawmempool` with verbose set to `true`.
 ///
 /// Map of txid to [`MempoolEntry`].
 #[derive(Clone, Debug, PartialEq, Deserialize, Serialize)]