Change tab to spaces

Author: robromano

docs/api-guide/status-codes.md

@@ -89,7 +89,7 @@ The 4xx class of status code is intended for cases in which the client seems to
     HTTP_428_PRECONDITION_REQUIRED
     HTTP_429_TOO_MANY_REQUESTS
     HTTP_431_REQUEST_HEADER_FIELDS_TOO_LARGE
-	HTTP_451_UNAVAILABLE_FOR_LEGAL_REASONS
+    HTTP_451_UNAVAILABLE_FOR_LEGAL_REASONS
 
 ## Server Error - 5xx