cli: Fix metavar for --get-crt .

caucase/cli.py

@@ -366,10 +366,10 @@ def main(argv=None):
     nargs=2,
     action='append',
     default=[],
-    metavar=('CSR_ID', 'CRL_PATH'),
+    metavar=('CSR_ID', 'CRT_PATH'),
     help='Retrieve the certificate identified by '
     'identifier and store it at given path. '
-    'If CSR_PATH exists and contains the private key corresponding to '
+    'If CRT_PATH exists and contains the private key corresponding to '
     'received certificate, certificate will be appended to that file. '
     'Can be given multiple times.',
   )