chore: fix typo

Author: omahs

docs/command/axoned_keys.md

@@ -17,7 +17,7 @@ The keyring supports the following backends:
     kwallet     Uses KDE Wallet Manager as a credentials management application.
     pass        Uses the pass command line utility to store and retrieve keys.
     test        Stores keys insecurely to disk. It does not prompt for a password to be unlocked
-                and it should be use only for testing purposes.
+                and it should be used only for testing purposes.
 
 kwallet and pass backends depend on external tools. Refer to their respective documentation for more
 information: