Correct commet style of version.h

src/objective-c/GRPCClient/private/version.h

@@ -31,10 +31,11 @@
  *
  */
 
-/* This file is autogenerated from a template file. Please make
- * modifications to
- * `templates/src/objective-c/GRPCClient/private/version.h.template`
- * instead. This file can be regenerated from the template by running
- * `tools/buildgen/generate_projects.sh`. */
+// This file is autogenerated from a template file. Please make
+// modifications to
+// `templates/src/objective-c/GRPCClient/private/version.h.template`
+// instead. This file can be regenerated from the template by running
+// `tools/buildgen/generate_projects.sh`.
+
 
 #define GRPC_OBJC_VERSION_STRING @"1.1.0-dev"

templates/src/objective-c/GRPCClient/private/version.h.template

@@ -33,10 +33,11 @@
    *
    */
 
-  /* This file is autogenerated from a template file. Please make
-   * modifications to
-   * `templates/src/objective-c/GRPCClient/private/version.h.template`
-   * instead. This file can be regenerated from the template by running
-   * `tools/buildgen/generate_projects.sh`. */
+  // This file is autogenerated from a template file. Please make
+  // modifications to
+  // `templates/src/objective-c/GRPCClient/private/version.h.template`
+  // instead. This file can be regenerated from the template by running
+  // `tools/buildgen/generate_projects.sh`.
+
 
   #define GRPC_OBJC_VERSION_STRING @"${settings.version}"