add section to Scheme compatibility manual on old executables

collects/scribblings/gui/miscwin-funcs.scrbl

@@ -90,8 +90,8 @@ The result depends on @scheme[what], and a @scheme[#f] result is only
  platform-specific:
   @itemize[
 
-  @item{@|AllUnix|: @indexed-file{.mredrc}}
-  @item{Windows: @indexed-file{mredrc.ss}}
+  @item{@|AllUnix|: @indexed-file{.gracketrc}}
+  @item{Windows: @indexed-file{racketrc.rktl}}
 
   ]}
 

collects/scribblings/scheme/compat.scrbl

@@ -0,0 +1,22 @@
+#lang scribble/manual
+
+@title[#:tag "compat-exe"]{Compatibility Executables}
+
+The following executables are included in the Racket distribution for
+compatibility with older versions of Racket:
+
+@itemlist[
+
+ @item{@as-index{@exec{mzscheme}} --- the same a @exec{racket -I scheme/base}}
+
+ @item{@as-index{@exec{mred}} --- the same a @exec{gracket -I scheme/base}}
+
+ @item{@as-index{@exec{drscheme}} --- the same as @exec{drracket}}
+
+ @item{@as-index{@exec{mzc}} --- an old interface to some of the tools
+       provided by @exec{raco}, including @exec{raco make} and
+       @exec{raco ctool}; use @exec{mzc --help} for more information}
+
+ @item{@as-index{@exec{plt-help}} --- the same as @exec{raco docs}}
+
+]

collects/scribblings/scheme/scheme.scrbl

@@ -48,11 +48,11 @@
 @(define-syntax-rule (compat sid rid)
    (compat-except sid rid))
 
-@title{@bold{Scheme}: Compatibility Libraries}
+@title{@bold{Scheme}: Compatibility Libraries and Executables}
 
 Racket was once called ``PLT Scheme,'' and a number of libraries with
 names starting @schemeidfont{scheme} provide compatibility with the
-old name.
+old name. A few @seclink["compat-exe"]{old executables} are also provided.
 
 @table-of-contents[]
 
@@ -287,3 +287,6 @@ and @|make-module-evaluator-id| from @racketmodname[racket/sandbox].}
 @compat[scheme/unsafe/ops racket/unsafe/ops]
 @compat[scheme/vector racket/vector]
 
+@; ----------------------------------------
+
+@include-section["compat.scrbl"]