Fix some parts to match the actual code.

[ tglx: Resolved the FIXMEs Gerd put in ]
Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Link: http://lkml.kernel.org/r/%3C1302426113-13808-3-git-send-email-geert%40linux-m68k.org%3ESigned-off-by: NThomas Gleixner <tglx@linutronix.de>
Cc: linux-doc@vger.kernel.org

Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Reviewed-by: NIngo Molnar <mingo@elte.hu>

This patch updates the IRQ docs to match reality.
Signed-off-by: NKrzysztof Halasa <khc@pm.waw.pl>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

Impact: documentation

struct irqaction is not documented. Add kernel doc comments and add
interrupt.h to the genirq docbook.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

Add missing section IDs to genericirq.tmpl
Signed-off-by: NRob Landley <rob@landley.net>
Cc: "Randy.Dunlap" <rdunlap@xenotime.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

desc-status --> desc->status
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Add docbook file - includes API documentation.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>