f Align HTTP header names

Author: tnull

blip-0055.md

@@ -426,8 +426,8 @@ registered webhook:
       running on.
     * Or some token that it issued on registration of the
       above information.
-  * MUST check that the `x-api-timestamp` and
-    `x-api-signature` HTTP headers exist and are the
+  * MUST check that the `x-lsps5-timestamp` and
+    `x-lsps5-signature` HTTP headers exist and are the
     expected formats.
   * MUST validate that the `POST` request body is a valid
     [JSON-RPC 2.0 Notification Object][], which is the