x86/xen: update outdated comment

The function xen_flush_tlb_others() was renamed xen_flush_tlb_multi()
by commit 4ce94ea ("x86/mm/tlb: Flush remote and local TLBs
concurrently").  Update the comment accordingly.

Signed-off-by: kexinsun <kexinsun@smail.nju.edu.cn>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Message-ID: <20260224022424.1718-1-kexinsun@smail.nju.edu.cn>

Author: kexinsun

arch/x86/xen/enlighten_pv.c

@@ -392,7 +392,7 @@ static void __init xen_init_capabilities(void)
 
 	/*
 	 * Xen PV would need some work to support PCID: CR3 handling as well
-	 * as xen_flush_tlb_others() would need updating.
+	 * as xen_flush_tlb_multi() would need updating.
 	 */
 	setup_clear_cpu_cap(X86_FEATURE_PCID);