Changing parameter name to be more accurate.

Author: ScoutHarris

WordPressKit/WordPressComServiceRemote.h

@@ -53,15 +53,16 @@ typedef void(^WordPressComServiceFailureBlock)(NSError *error);
  *
  * @param token          Token provided by Apple.
  * @param email          Apple email to use for new account.
- * @param userName       The username for the new account. Formed from the Apple ID fullname.
+ * @param fullName       The user's full name for the new account. Formed from the fullname
+ *                       property in the Apple ID credential.
  * @param clientID       wpcom client ID.
  * @param clientSecret   wpcom secret.
  * @param success        success block.
  * @param failure        failure block.
  */
 - (void)createWPComAccountWithApple:(NSString *)token
                            andEmail:(NSString *)email
-                        andUserName:(NSString *)userName
+                        andFullName:(NSString *)fullName
                         andClientID:(NSString *)clientID
                     andClientSecret:(NSString *)clientSecret
                             success:(WordPressComServiceSuccessBlock)success

WordPressKit/WordPressComServiceRemote.m

@@ -83,7 +83,7 @@ - (void)createWPComAccountWithGoogle:(NSString *)token
 
 - (void)createWPComAccountWithApple:(NSString *)token
                            andEmail:(NSString *)email
-                        andUserName:(NSString *)userName
+                        andFullName:(NSString *)fullName
                         andClientID:(NSString *)clientID
                     andClientSecret:(NSString *)clientSecret
                             success:(WordPressComServiceSuccessBlock)success
@@ -96,7 +96,7 @@ - (void)createWPComAccountWithApple:(NSString *)token
         @"service": @"apple",
         @"signup_flow_name": @"social",
         @"user_email": email,
-        @"user_name": userName,
+        @"user_name": fullName,
     };
 
     [self createSocialWPComAccountWithParams:params success:success failure:failure];