Modify and Merge comment format

Author: Tianyi Wang

aws/credentials/endpointcreds/provider.go

@@ -7,26 +7,26 @@
 //
 // Static credentials will never expire once they have been retrieved. The format
 // of the static credentials response:
-//	{
-//	    "AccessKeyId" : "MUA...",
-//	    "SecretAccessKey" : "/7PC5om....",
-//	}
+//    {
+//        "AccessKeyId" : "MUA...",
+//        "SecretAccessKey" : "/7PC5om....",
+//    }
 //
 // Refreshable credentials will expire within the "ExpiryWindow" of the Expiration
 // value in the response. The format of the refreshable credentials response:
-// 	{
-//	    "AccessKeyId" : "MUA...",
-//	    "SecretAccessKey" : "/7PC5om....",
-//	    "Token" : "AQoDY....=",
-//	    "Expiration" : "2016-02-25T06:03:31Z"
-//	}
+//    {
+//        "AccessKeyId" : "MUA...",
+//        "SecretAccessKey" : "/7PC5om....",
+//        "Token" : "AQoDY....=",
+//        "Expiration" : "2016-02-25T06:03:31Z"
+//    }
 //
 // Errors should be returned in the following format and only returned with 400
 // or 500 HTTP status codes.
-//	{
-//	    "code": "ErrorCode",
-//	    "message": "Helpful error message."
-//	}
+//    {
+//        "code": "ErrorCode",
+//        "message": "Helpful error message."
+//    }
 package endpointcreds
 
 import (