typo fix

config.js

@@ -51,7 +51,7 @@ Options:
 	--s3_force_path_style  Whether to force path style URLs for S3 objects. (default: false)
 	--s3_secret_key <secret>	S3 secret key, required if --s3_endpoint is set. (default: none) 
 	--s3_signature_version <version>	S3 signature version. (default: 4)
-	--s3_acl <canned-acl> S3 object acl. (deafult: public-read)
+	--s3_acl <canned-acl> S3 object acl. (default: public-read)
 	--s3_upload_everything	Upload all task results to S3. (default: upload only .zip archive and orthophoto)
 	--max_concurrency   <number>	Place a cap on the max-concurrency option to use for each task. (default: no limit)
 	--max_runtime	<number> Number of minutes (approximate) that a task is allowed to run before being forcibly canceled (timeout). (default: no limit)