fix: oras repo tags exlude-digest-tags documentation (oras-project#1467)

Signed-off-by: Terry Howe <terrylhowe@gmail.com>
Co-authored-by: Maël Valais <mael@vls.dev>

cmd/oras/root/repo/tags.go

@@ -47,7 +47,7 @@ Example - Show tags of the target repository:
   oras repo tags localhost:5000/hello
 
 Example - Show tags in the target repository with digest-like tags hidden:
-  oras repo tags --exclude-digest-tag localhost:5000/hello
+  oras repo tags --exclude-digest-tags localhost:5000/hello
 
 Example - Show tags of the target repository that include values lexically after last:
   oras repo tags --last "last_tag" localhost:5000/hello