polish comments

src/objective-c/GRPCClient/GRPCCallOptions.h

@@ -26,8 +26,10 @@ typedef NS_ENUM(NSUInteger, GRPCCallSafety) {
   GRPCCallSafetyDefault = 0,
   /** Signal that the call is idempotent. gRPC is free to use PUT verb. */
   GRPCCallSafetyIdempotentRequest = 1,
-  /** Signal that the call is cacheable and will not affect server state. gRPC is free to use GET
-   verb. */
+  /**
+    * Signal that the call is cacheable and will not affect server state. gRPC is free to use GET
+    * verb.
+    */
   GRPCCallSafetyCacheableRequest = 2,
 };
 
@@ -39,14 +41,14 @@ typedef NS_ENUM(NSInteger, GRPCCompressAlgorithm) {
   GRPCStreamCompressGzip,
 };
 
-// The transport to be used by a gRPC call
+/** The transport to be used by a gRPC call */
 typedef NS_ENUM(NSInteger, GRPCTransportType) {
   GRPCTransportTypeDefault = 0,
-  // gRPC internal HTTP/2 stack with BoringSSL
+  /** gRPC internal HTTP/2 stack with BoringSSL */
   GRPCTransportTypeChttp2BoringSSL = 0,
-  // Cronet stack
+  /** Cronet stack */
   GRPCTransportTypeCronet,
-  // Insecure channel. FOR TEST ONLY!
+  /** Insecure channel. FOR TEST ONLY! */
   GRPCTransportTypeInsecure,
 };