ISDN: update Documentation/isdn/00-INDEX

After the merging of mISDN, state which files refer only to the
old isdn4linux subsystem. Also add a few missing files and sort
alphabetically.

Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/isdn/00-INDEX

@@ -2,28 +2,20 @@
 	- this file (info on ISDN implementation for Linux)
 CREDITS
 	- list of the kind folks that brought you this stuff.
+HiSax.cert
+	- information about the ITU approval certification of the HiSax driver.
 INTERFACE
-	- description of Linklevel and Hardwarelevel ISDN interface.
+	- description of isdn4linux Link Level and Hardware Level interfaces.
+INTERFACE.fax
+	- description of the fax subinterface of isdn4linux.
 README
 	- general info on what you need and what to do for Linux ISDN.
 README.FAQ
 	- general info for FAQ.
-README.audio
-	- info for running audio over ISDN.
-README.fax
-	- info for using Fax over ISDN.
-README.icn
-	- info on the ICN-ISDN-card and its driver.
 README.HiSax
 	- info on the HiSax driver which replaces the old teles.
-README.hfc-pci
-	- info on hfc-pci based cards.
-README.pcbit
-	- info on the PCBIT-D ISDN adapter and driver.
-README.syncppp
-	- info on running Sync PPP over ISDN.
-syncPPP.FAQ
-	- frequently asked questions about running PPP over ISDN.
+README.audio
+	- info for running audio over ISDN.
 README.avmb1
 	- info on driver for AVM-B1 ISDN card.
 README.act2000
@@ -34,10 +26,25 @@ README.concap
 	- info on "CONCAP" encapsulation protocol interface used for X.25.
 README.diversion
 	- info on module for isdn diversion services.
-README.sc
-	- info on driver for Spellcaster cards.
-README.x25
-    _ info for running X.25 over ISDN.
+README.fax
+	- info for using Fax over ISDN.
+README.gigaset
+	- info on the drivers for Siemens Gigaset ISDN adapters
+README.hfc-pci
+	- info on hfc-pci based cards.
 README.hysdn
         - info on driver for Hypercope active HYSDN cards
- 
+README.icn
+	- info on the ICN-ISDN-card and its driver.
+README.mISDN
+	- info on the Modular ISDN subsystem (mISDN)
+README.pcbit
+	- info on the PCBIT-D ISDN adapter and driver.
+README.sc
+	- info on driver for Spellcaster cards.
+README.syncppp
+	- info on running Sync PPP over ISDN.
+README.x25
+	- info on running X.25 over ISDN.
+syncPPP.FAQ
+	- frequently asked questions about running PPP over ISDN.