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.

Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: Karsten Keil <keil@b1-systems.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/isdn/00-INDEX

@@ -2,8 +2,12 @@
 	- 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
@@ -12,6 +16,8 @@ README.audio
 	- info for running audio over ISDN.
 README.fax
 	- info for using Fax over ISDN.
+README.gigaset
+	- info on the drivers for Siemens Gigaset ISDN adapters.
 README.icn
 	- info on the ICN-ISDN-card and its driver.
 README.HiSax
@@ -37,7 +43,8 @@ README.diversion
 README.sc
 	- info on driver for Spellcaster cards.
 README.x25
-    _ info for running X.25 over ISDN.
+	- info for running X.25 over ISDN.
 README.hysdn
-        - info on driver for Hypercope active HYSDN cards
+	- info on driver for Hypercope active HYSDN cards
- 
+README.mISDN
+	- info on the Modular ISDN subsystem (mISDN).