IRQ-affinity.txt: standardize document format

Each text file under Documentation follows a different
format. Some doesn't even have titles!

Change its representation to follow the adopted standard,
using ReST markups for it to be parseable by Sphinx:

- Add a title for the document;
- mark literal blocks as such;
- use a bulleted list for changelog.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/IRQ-affinity.txt

@@ -1,8 +1,11 @@
-ChangeLog:
-	Started by Ingo Molnar <mingo@redhat.com>
-	Update by Max Krasnyansky <maxk@qualcomm.com>
-
+================
 SMP IRQ affinity
+================
+
+ChangeLog:
+	- Started by Ingo Molnar <mingo@redhat.com>
+	- Update by Max Krasnyansky <maxk@qualcomm.com>
+
 
 /proc/irq/IRQ#/smp_affinity and /proc/irq/IRQ#/smp_affinity_list specify
 which target CPUs are permitted for a given IRQ source.  It's a bitmask
@@ -16,7 +19,7 @@ will be set to the default mask. It can then be changed as described above.
 Default mask is 0xffffffff.
 
 Here is an example of restricting IRQ44 (eth1) to CPU0-3 then restricting
-it to CPU4-7 (this is an 8-CPU SMP box):
+it to CPU4-7 (this is an 8-CPU SMP box)::
 
 	[root@moon 44]# cd /proc/irq/44
 	[root@moon 44]# cat smp_affinity
@@ -39,6 +42,8 @@ As can be seen from the line above IRQ44 was delivered only to the first four
 processors (0-3).
 Now lets restrict that IRQ to CPU(4-7).
 
+::
+
 	[root@moon 44]# echo f0 > smp_affinity
 	[root@moon 44]# cat smp_affinity
 	000000f0
@@ -55,7 +60,7 @@ round-trip min/avg/max = 0.1/0.5/585.4 ms
 This time around IRQ44 was delivered only to the last four processors.
 i.e counters for the CPU0-3 did not change.
 
-Here is an example of limiting that same irq (44) to cpus 1024 to 1031:
+Here is an example of limiting that same irq (44) to cpus 1024 to 1031::
 
 	[root@moon 44]# echo 1024-1031 > smp_affinity_list
 	[root@moon 44]# cat smp_affinity_list