Usage consistency

libexec/rbenv-hooks

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
-# Summary: List hook scripts for a rbenv command
-# Usage: rbenv hooks COMMAND
+# Summary: List hook scripts for a given rbenv command
+# Usage: rbenv hooks <command>
 
 set -e
 [ -n "$RBENV_DEBUG" ] && set -x

libexec/rbenv-whence

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 # Summary: List all Ruby versions that contain the given executable
-# Usage: rbenv whence [--path] COMMAND
+# Usage: rbenv whence [--path] <command>
 
 set -e
 [ -n "$RBENV_DEBUG" ] && set -x