gnu packages: Clean up synopses and descriptions.

* gnu/packages/admin.scm, gnu/packages/algebra.scm, gnu/packages/audio.scm,
  gnu/packages/backup.scm, gnu/packages/base.scm, gnu/packages/bittorrent.scm,
  gnu/packages/code.scm, gnu/packages/compression.scm,
  gnu/packages/databases.scm, gnu/packages/enchant.scm,
  gnu/packages/firmware.scm, gnu/packages/fonts.scm,
  gnu/packages/freedesktop.scm, gnu/packages/games.scm, gnu/packages/gd.scm,
  gnu/packages/gl.scm, gnu/packages/gnome.scm, gnu/packages/gsasl.scm,
  gnu/packages/gstreamer.scm, gnu/packages/gtk.scm, gnu/packages/guile.scm,
  gnu/packages/haskell.scm, gnu/packages/language.scm,
  gnu/packages/lesstif.scm, gnu/packages/libreoffice.scm,
  gnu/packages/linux.scm, gnu/packages/llvm.scm, gnu/packages/maths.scm,
  gnu/packages/mcrypt.scm, gnu/packages/mit-krb5.scm, gnu/packages/mp3.scm,
  gnu/packages/ncdu.scm, gnu/packages/networking.scm, gnu/packages/ntp.scm,
  gnu/packages/ocaml.scm, gnu/packages/openbox.scm, gnu/packages/pdf.scm,
  gnu/packages/perl.scm, gnu/packages/pretty-print.scm,
  gnu/packages/pulseaudio.scm, gnu/packages/python.scm,
  gnu/packages/rdesktop.scm, gnu/packages/rdf.scm, gnu/packages/ruby.scm,
  gnu/packages/slang.scm, gnu/packages/slim.scm, gnu/packages/telephony.scm,
  gnu/packages/tls.scm, gnu/packages/tmux.scm, gnu/packages/tre.scm,
  gnu/packages/unrtf.scm, gnu/packages/version-control.scm,
  gnu/packages/vpn.scm, gnu/packages/web.scm, gnu/packages/wget.scm,
  gnu/packages/xdisorg.scm, gnu/packages/xfce.scm, gnu/packages/xiph.scm:
  Fix typos.  Trim long lines.  Add missing periods in the end of sentences.
  Use double spaces between sentences.  Remove trailing whitespaces.

gnu/packages/telephony.scm

@@ -124,7 +124,7 @@ to initiate and control SIP sessions.")
    (version "4.1.0")
    (source (origin
             (method url-fetch)
-            (uri (string-append 
+            (uri (string-append
                   "http://download.savannah.gnu.org/releases/exosip/libeXosip2-"
                   version ".tar.gz"))
             (sha256 (base32
@@ -133,11 +133,11 @@ to initiate and control SIP sessions.")
    (inputs `(("osip" ,osip)))
    (synopsis "Sip abstraction library")
    (description "EXosip is a library that hides the complexity of using the
-SIP protocol for mutlimedia session establishement.  This protocol is mainly to
+SIP protocol for multimedia session establishment.  This protocol is mainly to
 be used by VoIP telephony applications (endpoints or conference server) but
-might be also usefull for any application that wish to establish sessions like
+might be also useful for any application that wish to establish sessions like
 multiplayer games.")
-   (license gpl2+) 
+   (license gpl2+)
    ;; (plus OpenSSL linking exception)
    ;; http://git.savannah.gnu.org/cgit/exosip.git/plain/LICENSE.OpenSSL
     (home-page "http://savannah.nongnu.org/projects/exosip")))
@@ -153,23 +153,23 @@ multiplayer games.")
             (sha256 (base32
                      "0117c5iid1vrwl7sl3pys2jlinpmx2vfp8wcdwk93m7cc6k9793b"))))
    (build-system gnu-build-system)
-   ;; The configure.ac uses pkg-config but in a kludgy way which breaks when 
+   ;; The configure.ac uses pkg-config but in a kludgy way which breaks when
    ;; cross-compiling.  Among other issues there the program name "pkg-config"
    ;; is hard coded instead of respecting the PKG_CONFIG environment variable.
-   ;; Fortunately we can avoid the use of pkg-config and set the dependency 
-   ;; flags ourselves. 
-   (arguments `(#:configure-flags 
+   ;; Fortunately we can avoid the use of pkg-config and set the dependency
+   ;; flags ourselves.
+   (arguments `(#:configure-flags
                 `("--without-pkg-config"
-                  ,(string-append "UCOMMON_CFLAGS=-I" 
+                  ,(string-append "UCOMMON_CFLAGS=-I"
                                   (assoc-ref %build-inputs "ucommon") "/include")
                   "UCOMMON_LIBS=-lusecure -lucommon -lrt -ldl -lpthread"
-                  ,(string-append "LIBOSIP2_CFLAGS=-I" 
+                  ,(string-append "LIBOSIP2_CFLAGS=-I"
                                   (assoc-ref %build-inputs "osip") "/include")
                   "LIBOSIP2_LIBS=-losipparser2 -losip2"
-                  ,(string-append "--sysconfdir=" (assoc-ref %outputs "out") 
+                  ,(string-append "--sysconfdir=" (assoc-ref %outputs "out")
                                   "/etc")
                   "EXOSIP2_LIBS=-leXosip2"
-                  ,(string-append "EXOSIP2_CFLAGS=-I" 
+                  ,(string-append "EXOSIP2_CFLAGS=-I"
                                   (assoc-ref %build-inputs "exosip")
                                   "/include"))))
    (inputs `(("ucommon" ,ucommon)