Update src/api/archive_unstable_stopStorageDiff.md

Co-authored-by: Niklas Adolfsson <[email protected]>

Author: lexnv

src/api/archive_unstable_stopStorageDiff.md

@@ -6,6 +6,6 @@
 
 **Return value**: *null*
 
-Stops a subscription started with `archive_unstable_StorageDiff`. Has no effect if the opaque string is invalid or refers to a subscription that has already emitted a `{"event": "storageDiffDone"}` event.
+Stops a subscription started with `archive_unstable_storageDiff`. Has no effect if the opaque string is invalid or refers to a subscription that has already emitted a `{"event": "storageDiffDone"}` event.
 
 JSON-RPC client implementations must be aware that, due to the asynchronous nature of JSON-RPC client <-> server communication, they might still receive chain updates notifications, for example because these notifications were already in the process of being sent back by the JSON-RPC server.