Update the description and short description

Closes: #1052400

debian/control

@@ -17,7 +17,7 @@ Package: php-zumba-json-serializer
 Architecture: all
 Multi-Arch: foreign
 Depends: ${misc:Depends}, ${phpcomposer:Debian-require}
-Description: Json Serializer is a PHP library to serialize PHP variables in JSON format
+Description: Library to serialize PHP variables in JSON format
  Json Serializer is similar to the serialize() function in PHP,
  you can also un-serialize the JSON generated by this tool
- and have you PHP content back.
+ and have the PHP content back.