x86/entry: Fix typos in comments

Fix 2 typos in the comments.

Signed-off-by: Xin Li (Intel) <xin@zytor.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Link: https://lore.kernel.org/r/20230926061319.1929127-1-xin@zytor.com

Author: xinli-intel

arch/x86/entry/entry_64.S

@@ -1163,8 +1163,8 @@ SYM_CODE_START(asm_exc_nmi)
 	 * anyway.
 	 *
 	 * To handle this case we do the following:
-	 *  Check the a special location on the stack that contains
-	 *  a variable that is set when NMIs are executing.
+	 *  Check a special location on the stack that contains a
+	 *  variable that is set when NMIs are executing.
 	 *  The interrupted task's stack is also checked to see if it
 	 *  is an NMI stack.
 	 *  If the variable is not set and the stack is not the NMI
@@ -1294,8 +1294,8 @@ SYM_CODE_START(asm_exc_nmi)
 	 * end_repeat_nmi, then we are a nested NMI.  We must not
 	 * modify the "iret" frame because it's being written by
 	 * the outer NMI.  That's okay; the outer NMI handler is
-	 * about to about to call exc_nmi() anyway, so we can just
-	 * resume the outer NMI.
+	 * about to call exc_nmi() anyway, so we can just resume
+	 * the outer NMI.
 	 */
 
 	movq	$repeat_nmi, %rdx