typos corrected

dvc/remote/local.py

@@ -264,7 +264,7 @@ class RemoteLOCAL(RemoteBASE):
 
         # This is a performance optimization. We can safely assume that,
         # if the resources that we want to fetch are already cached,
-        # there's no need to check the remote storage for the existance of
+        # there's no need to check the remote storage for the existence of
         # those files.
         if download and sorted(local_exists) == sorted(md5s):
             remote_exists = local_exists

dvc/remote/s3.py

@@ -150,7 +150,7 @@ class RemoteS3(RemoteBASE):
         # could use any value >= ContentLength.
         #
         # If an object's etag looks like '50d67013a5e1a4070bef1fc8eea4d5f9-13',
-        # then it was transfered as a multipart, which means that the chunk
+        # then it was transferred as a multipart, which means that the chunk
         # size used to transfer it was less than ContentLength of that object.
         # Unfortunately, in general, it doesn't mean that the chunk size was
         # the same throughout the transfer, so it means that in order to