Fix italic issue with content

Disable empty <subtitle/> and convert

  <meta name="category">Packaging</meta>

into:

  <meta name="category" content="Packaging"/>

xml/MAIN-SBP-RPM-Packaging.xml

@@ -9,7 +9,7 @@
     xml:lang="en">
     <info>
         <title>Introduction to RPM Packaging</title>
-        <subtitle/>
+<!--        <subtitle/>-->
         <!--<orgname>SUSE Best Practices</orgname>-->
         <productname>SUSE Linux Enterprise, openSUSE</productname>
         <productnumber/>
@@ -21,10 +21,8 @@
             <dm:editurl>https://github.com/SUSE/suse-best-practices/edit/main/xml/</dm:editurl>
         </dm:docmanager>
 
-
-
             <meta name="series">SUSE Best Practices</meta>
-            <meta name="category">Packaging</meta>
+            <meta name="category" content="Packaging"/>
 
             <meta name="platform">SUSE Linux Enterprise</meta>
             <meta name="platform">openSUSE</meta>
@@ -40,22 +38,6 @@
             <orgname>SUSE</orgname>
             </affiliation>
             </author>
-         <!--   <author>
-            <personname>
-            <firstname></firstname>
-            <surname></surname>
-            </personname>
-            <affiliation>
-            <jobtitle></jobtitle>
-            <orgname></orgname>
-            </affiliation>
-            </author>
-            <editor>
-            <orgname></orgname>
-            </editor>
-            <othercredit>
-            <orgname></orgname>
-            </othercredit>-->
             </authorgroup>
 
             <cover role="logos">
@@ -73,7 +55,7 @@
 
         <abstract>
             <para>In general, a pre-built, open source application is called a <emphasis
-                    role="italic">package</emphasis> and bundles all the binary, data, and
+                 >package</emphasis> and bundles all the binary, data, and
                 configuration files required to run the application. A package also includes all the
                 steps required to deploy the application on a system, typically in the form of a
                 script. The script might generate data, start and stop system services, or
@@ -82,7 +64,7 @@
 
             <para>Because each operating system has its idiosyncrasies, a package is typically
                 tailored to a specific system. Moreover, each operating system provides its own
-                    <emphasis role="italic">package manager</emphasis>, a special utility to add and
+                    <emphasis>package manager</emphasis>, a special utility to add and
                 remove packages from the system. SUSE-based systems – openSUSE and SUSE Linux
                 Enterprise - use the RPM Package Manager. The package manager precludes partial and
                 faulty installations and <quote>uninstalls</quote> by adding and removing the files