Document client name requirements

Supreeeme · Supreeeme · commit 6068238b19ae · 2025-10-02T11:36:44.000-04:00
diff --git a/doc/pages/commands.asciidoc b/doc/pages/commands.asciidoc
@@ -142,6 +142,7 @@ of the file onto the filesystem
 
 *rename-client* <name>::
     set current client name
+    Client names may only contain letters, numbers, `-`, and `_`.
 
 *rename-session* <name>::
     set current session name
