Erroneous example JSON, has http status, and missing space. Fixed. (#1383)

Author: shwoodard

aip/general/0193.md

@@ -29,7 +29,7 @@ assume that the user will know anything about its underlying
 implementation.
 
 Error messages **should** be brief but actionable. Any extra information
-**should** be provided in the `details`field. If even more information
+**should** be provided in the `details` field. If even more information
 is necessary, you **should** provide a link where a reader can get more
 information or ask questions to help resolve the issue. It is also
 important to [set the right tone][writing-tone] when writing messages.
@@ -50,7 +50,7 @@ users.
 ```json
 {
   "error": {
-    "code": 8,
+    "code": 429,
     "message": "The zone 'us-east1-a' does not have enough resources available to fulfill the request. Try a different zone, or try again later.",
     "status": "RESOURCE_EXHAUSTED",
     "details": [