fixup comments in the s3 backend

Author: grahamc

nixops/storage/s3.py

@@ -37,10 +37,10 @@ def __init__(self, args: S3BackendOptions) -> None:
         self.kms_keyid = args.kms_keyid
         self.aws = boto3.Session(region_name=self.region, profile_name=self.profile)
 
-    # fetchToFile: acquire a lock and download the state file to
-    # the local disk. Note: no arguments will be passed over kwargs.
-    # Making it part of the type definition allows adding new
-    # arguments later.
+    # fetchToFile: download the state file from the user's S3 bucket
+    # to the local disk.
+    # Note: no arguments will be passed over kwargs. Making it part of
+    # the type definition allows adding new arguments later.
     def fetchToFile(self, path: str, **kwargs) -> None:
         try:
             with open(path, "wb") as f:
@@ -58,7 +58,7 @@ def fetchToFile(self, path: str, **kwargs) -> None:
     def onOpen(self, sf: nixops.statefile.StateFile, **kwargs) -> None:
         pass
 
-    # uploadFromFile: upload the new state file and release any locks
+    # uploadFromFile: upload the new version of the state file
     # Note: no arguments will be passed over kwargs. Making it part of
     # the type definition allows adding new arguments later.
     def uploadFromFile(self, path: str, **kwargs) -> None: