Rename shape_handle -> handle in openapi docs (#1930)

website/electric-api.yaml

@@ -102,16 +102,16 @@ paths:
           description: |-
             This is a cursor generated by the server during live requests. It helps bust caches for
             responses from previous long-polls.
-        - name: shape_handle
+        - name: handle
           in: query
           schema:
             type: string
           example: "3833821-1721812114261"
           description: |-
             The shape handle returned by the initial shape request.
 
-            This is a required parameter when this is not an initial sync request.
-            I.e. when offset is not `-1`.
+            This is a required parameter when this is not an initial sync request,
+            i.e. when offset is not `-1`.
         - name: where
           in: query
           schema: