docs: x86: replace do_IRQ int the entry_64.rst with common_interrupt()

do_IRQ has been replaced by common_interrupt in commit
fa5e5c40 ("x86/entry: Use idtentry for interrupts").
Signed-off-by: Tuo Cao <91tuocao@gmail.com>
Link: https://lore.kernel.org/r/20220915150155.9908-1-91tuocao@gmail.comSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/x86/entry_64.rst

@@ -33,8 +33,8 @@ Some of these entries are:
  - interrupt: An array of entries.  Every IDT vector that doesn't
    explicitly point somewhere else gets set to the corresponding
    value in interrupts.  These point to a whole array of
-   magically-generated functions that make their way to do_IRQ with
-   the interrupt number as a parameter.
+   magically-generated functions that make their way to common_interrupt()
+   with the interrupt number as a parameter.
 
  - APIC interrupts: Various special-purpose interrupts for things
    like TLB shootdown.