Revise comments about TeX & LaTeX for accuracy.

This closes SF bug #456222.

Doc/doc/doc.tex

@@ -1576,10 +1576,11 @@ This \UNIX\ is also followed by a space.
         Emacs Texinfo code in a portable manner.
 
       \item[\program{latex}]
-        This is a world-class typesetter by Donald Knuth.  It is used
-        for the conversion to PostScript, and is needed for the HTML
-        conversion as well (\LaTeX2HTML requires one of the
-        intermediate files it creates).
+        \LaTeX{} is a large and extensible macro package by Leslie
+        Lamport, based on \TeX, a world-class typesetter by Donald
+        Knuth.  It is used for the conversion to PostScript, and is
+        needed for the HTML conversion as well (\LaTeX2HTML requires
+        one of the intermediate files it creates).
 
       \item[\program{latex2html}]
         Probably the longest Perl script anyone ever attempted to
@@ -1596,7 +1597,8 @@ This \UNIX\ is also followed by a space.
         Just about any version should work for the standard documents,
         but GNU \program{make} is required for the experimental
         processes in \file{Doc/tools/sgmlconv/}, at least while
-        they're experimental.
+        they're experimental.  This is not required for running the
+        \rpgram{mkhowto} script.
 
       \item[\program{makeindex}]
         This is a standard program for converting \LaTeX{} index data