package/libeXosip2: fix typos in help text

Signed-off-by: Iulian Onofrei <iulian.onofrei@yahoo.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit fef674dbf55db74802e55ada3e2f3a22c55f5e7a)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libeXosip2/Config.in

@@ -4,10 +4,10 @@ config BR2_PACKAGE_LIBEXOSIP2
 	select BR2_PACKAGE_LIBOSIP2
 	help
 	  eXosip is a library that hides the complexity of using the
-	  SIP protocol for mutlimedia session establishement.
+	  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
+	  also useful for any application that wish to establish
 	  sessions like multiplayer games.
 	  eXosip is based in libosip.