patch 8.1.1306: Borland support is outdated and doesn't work

Problem:    Borland support is outdated and doesn't work.
Solution:   Remove Borland support, there are other (free) compilers
            available. (Thomas Dziedzic, Ken Takata, closes #4364)
diff --git a/runtime/doc/debug.txt b/runtime/doc/debug.txt
index 37a5772..4564565 100644
--- a/runtime/doc/debug.txt
+++ b/runtime/doc/debug.txt
@@ -80,9 +80,8 @@
 
 If you have Visual Studio, use that instead of the VC Toolkit and WinDbg.
 
-For other compilers, you should always use the corresponding debugger: TD for
-a Vim executable compiled with the Borland compiler; gdb (see above
-|debug-gcc|) for the Cygwin and MinGW compilers.
+For other compilers, you should always use the corresponding debugger: gdb
+(see above |debug-gcc|) for the Cygwin and MinGW compilers.
 
 
 								*debug-vs2005*