graphql: Fix example queries

The example queries were missing the outer query { ... } element (or
just { ...  })

graphql.md

@@ -85,7 +85,7 @@ query which is supported on all APIs is:
 
 ```json
 {
-    "query": "version { major, minor, patch }"
+    "query": "{ version { major, minor, patch } }"
 }
 ```
 
@@ -100,7 +100,7 @@ oauth_token=your oauth token
 curl \
   --oauth2-bearer="$oauth_token" \
   -H 'Content-Type: application/json' \
-  -d '{"query": "version { major, minor, patch }"}' \
+  -d '{"query": "{ version { major, minor, patch } }"}' \
   https://meta.sr.ht/query
 ```