Improve package description in agreement with GNU documentation.

autoconf/autoconf.spec

@@ -52,11 +52,13 @@ AutoReq:      no
 AutoReqProv:  no
 
 %description
-    GNU Autoconf is a package for generating configure scripts. These
-    scripts are present in a large number of free software packages and
-    are used to detect system features at compilation time. Autoconf
-    is mostly needed by people producing packages that run on a wide
-    variety of platforms--particularly UNIX-a-likes.
+    Autoconf is an extensible package of m4 macros that produce
+    shell scripts to automatically configure software source code
+    packages.  These scripts can adapt the packages to many kinds of
+    UNIX-like systems without manual user intervention.  Autoconf
+    creates a configuration script for a package from a template
+    file that lists the operating system features that the package
+    can use, in the form of m4 macro calls.
 
 %prep
     %setup0 -q -c -n autoconf-%{V_latest}