Documentation/x86: Rename IRQSTACKSIZE to IRQ_STACK_SIZE

The IRQSTACKSIZE was renamed to the IRQ_STACK_SIZE in the
(26f80bd6a9 x86-64: Convert irqstacks to per-cpu) commit,
but it still named IRQSTACKSIZE in the documentation. This
patch fixes this.

Signed-off-by: Alexander Kuleshov <kuleshovmail@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/x86/kernel-stacks b/Documentation/x86/kernel-stacks
index 0f3a6c2..9a0aa4d 100644
--- a/Documentation/x86/kernel-stacks
+++ b/Documentation/x86/kernel-stacks
@@ -16,7 +16,7 @@
 is in control on that CPU; when a CPU returns to user space the
 specialized stacks contain no useful data.  The main CPU stacks are:
 
-* Interrupt stack.  IRQSTACKSIZE
+* Interrupt stack.  IRQ_STACK_SIZE
 
   Used for external hardware interrupts.  If this is the first external
   hardware interrupt (i.e. not a nested hardware interrupt) then the