Fix appstream file

(cherry picked from commit f25bc6bac6)

org.kde.neochat.appdata.xml

@@ -70,8 +70,7 @@
   <url type="homepage">https://kde.org</url>
   <url type="bugtracker">https://bugs.kde.org</url>
   <categories>
-    <category>Matrix</category>
-    <category>Internet</category>
+    <category>Network</category>
   </categories>
   <developer_name>The KDE Community</developer_name>
   <developer_name xml:lang="ca">La comunitat KDE</developer_name>
@@ -107,7 +106,7 @@
   <releases>
     <release version="1.0.1" date="2021-01-13">
       <description>
-        <p>This version fixes several bugs.<p>
+        <p>This version fixes several bugs.</p>
         <ul>
           <li>NeoChat doesn't require a .well-know configuration in the server to work.</li>
           <li>Edited messages won't show up duplicated anymore.</li>