docs: improve SSH cache CLI action descriptions

- Clarify that +list-ssh-cache shows shell integration cached hosts
- Add note about +clear-ssh-cache command and when to use it

Addresses mitchellh's feedback on action descriptions.

src/cli/action.zig

@@ -43,7 +43,7 @@ pub const Action = enum {
     /// List keybind actions
     @"list-actions",
 
-    /// List hosts with Ghostty SSH terminfo installed
+    /// List hosts cached by SSH shell integration for terminfo installation
     @"list-ssh-cache",
 
     /// Clear Ghostty SSH terminfo cache

src/cli/list_ssh_cache.zig

@@ -21,6 +21,9 @@ pub const Options = struct {
 /// This command shows all remote hosts where Ghostty's terminfo has been successfully
 /// installed through the SSH integration. The cache is automatically maintained when
 /// connecting to remote hosts with `shell-integration-features = ssh-terminfo` enabled.
+///
+/// Use `+clear-ssh-cache` to remove cached entries if you need to force terminfo
+/// reinstallation or clean up stale host entries.
 pub fn run(alloc: Allocator) !u8 {
     var opts: Options = .{};
     defer opts.deinit();