Fix typo (#921)

Author: blue-hope

aip/general/0135.md

@@ -130,7 +130,7 @@ explicitly opt in to a cascading delete.
 message DeletePublisherRequest {
   // The name of the publisher to delete.
   // Format: publishers/{publisher}
-  string name = 1 = [
+  string name = 1 [
     (google.api.field_behavior) = REQUIRED,
     (google.api.resource_reference) = {
       type: "library.googleapis.com/Publisher"