Update documentation to reflect new .yadm/encrypt functionality

yadm.1

@@ -586,6 +586,11 @@ For example:
     .gnupg/*.gpg
 .RE
 
+Standard filename expansions (*, ?, [) are supported. Other shell expansions
+like brace and tilde are not supported. Spaces in paths are supported, and
+should not be quoted. If a directory is specified, its contents will be
+included, but not recursively. Paths beginning with a "!" will be excluded.
+
 The
 .B yadm encrypt
 command will find all files matching the patterns, and prompt for a password. Once a