style: fix yaml syntax on wasm (#4794)

Signed-off-by: Samantha Coyle <[email protected]>
Co-authored-by: Mark Fussell <[email protected]>

Author: sicoyle

daprdocs/content/en/reference/components-reference/supported-middleware/middleware-wasm.md

@@ -39,7 +39,7 @@ spec:
   metadata:
   - name: url
     value: "file://router.wasm"
-  - guestConfig
+  - name: guestConfig
     value: {"environment":"production"}
 ```