fixup comments in the s3 backend

nixops/storage/s3.py

@@ -35,10 +35,10 @@ 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:
@@ -56,7 +56,7 @@ 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: