installer: Aris: update synopis and description.

* gnu/packages/maths.scm (aris): Use the synopsis and description from the
web page instead of the README file.

gnu/packages/maths.scm

@@ -95,24 +95,26 @@
 
 (define-public aris
   (package
-   (name "aris")
-   (version "2.2")
-   (source (origin
-            (method url-fetch)
-            (uri (string-append "mirror://gnu/" name "/" name "-" version ".tar.gz"))
-            (sha256 (base32
-                     "1hlvpzrh7hzzf533diyfiabzskddi8zx92av9hwkjw3l46z7qv01"))))
-   (build-system gnu-build-system)
-   (inputs `(("gtk+" ,gtk+)
-             ("libxml2" ,libxml2)))
-   (native-inputs `(("pkg-config" ,pkg-config)))
-   (synopsis "Logical proof program")
-   (description
-    "Aris is a logical proof program, and supports propositional and predicate
-logic, Boolean algebra, and arithmetical logic in the form of abstract
-sequences (seqlog).")
-   (license license:gpl3+)
-   (home-page "http://www.gnu.org/software/aris/")))
+    (name "aris")
+    (version "2.2")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "mirror://gnu/" name "/" name "-" version ".tar.gz"))
+              (sha256 (base32
+                       "1q1887ryqdr9sn0522hc7p16kqwlxxyz5dkmma8ar2nxplhgll7q"))))
+    (build-system gnu-build-system)
+    (inputs `(("gtk+" ,gtk+)
+              ("libxml2" ,libxml2)))
+    (native-inputs `(("pkg-config" ,pkg-config)))
+    (synopsis "Natural deduction first-order logic interface")
+    (description "Aris is a program for performing logical proofs.  It supports
+propositional and predicate logic, as well as Boolean algebra and
+arithmetical logic.  In addition to its predefined inference and equivalence
+rules, Aris also supports references to older proofs.  Its use of standard
+logical symbols and its natural deduction interface make it easy to use for
+beginners.")
+    (license license:gpl3+)
+    (home-page "http://www.gnu.org/software/aris/")))
 
 (define-public c-graph
   (package