Added links to Linux-DOSEMU FAQ and Runderwo's patch.

docs/sbbsunix.txt

@@ -50,10 +50,13 @@ A. Yes. As long as all the nodes can access the same live data files (via LAN)
    as you wish.
 
 Q. Does Synchronet for Unix support external DOS programs/doors?
-A. Currently, only the FreeBSD build has doscmd support "built-in". Other
+A. Currently, only the FreeBSD build has doscmd support "built-in" (and this
+   "support" requires Deuce's version of doscmd with FOSSIL emulation). Other
    platforms can use DOSEMU or whatever is available for running DOS programs.
-   There is currently no available documentation for using Synchronet with
-   DOSEMU on Linux (or other platforms), but there should be soon.
+   There's a patch for "building-in" DOSEMU support with Synchronet for Linux:
+   http://forge.icequake.net/syncmods/index.html
+   and a FAQ for using DOSEMU with Synchronet for Linux (without a patch):
+   http://www.exeonline.com/bbs/howto-doors.txt
 
 Q. What external programs/doors does Synchronet for Unix support?
 A. External programs can either use standard I/O (e.g. bash, pico, Lord/X,
@@ -117,7 +120,7 @@ Note: Skip to step 8 if you are updating an existing Synchronet installation.
    B. Build the main executable (and utilities):
       gmake
       (please report build errors to rob@synchro.net)
-      Note: warnings (if any) can be safely ignored
+      Note: Warnings (if any) can be safely ignored
 
    C. Change to this directory:
       cd /sbbs/src/sbbs3/scfg
@@ -125,7 +128,7 @@ Note: Skip to step 8 if you are updating an existing Synchronet installation.
    D. Build the Synchronet configuration utility (SCFG):
       gmake
       (please report build errors to rob@synchro.net)
-      Note: warnings (if any) can be safely ignored
+      Note: Warnings (if any) can be safely ignored
 
    E. Congratulate yourself on a job well-done.