man: fix unused, inaccurate metadata

Dates aren't shown in the manpages.  So they are not really useful,
and no-one is going to remember to update them.

"<refmiscinfo class="version"></refmiscinfo>" sounds even less useful.

I leave the unused "title" and "productname" tags.  They could
theoretically be useful, and aren't hard to maintain.  We just need to
fix the "title" for udevadm.

Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>

udev/udev.xml

@@ -8,14 +8,12 @@
     <refentry>
       <refentryinfo>
         <title>udev</title>
-        <date>August 2005</date>
         <productname>udev</productname>
       </refentryinfo>
 
       <refmeta>
         <refentrytitle>udev</refentrytitle>
         <manvolnum>7</manvolnum>
-        <refmiscinfo class="version"></refmiscinfo>
       </refmeta>
 
       <refnamediv>

udev/udevadm.xml

@@ -7,8 +7,7 @@
     <title>udevadm</title>
     <refentry>
       <refentryinfo>
-        <title>udevd</title>
-        <date>November 2007</date>
+        <title>udevadm</title>
         <productname>udev</productname>
       </refentryinfo>
 

udev/udevd.xml

@@ -8,7 +8,6 @@
     <refentry>
       <refentryinfo>
         <title>udevd</title>
-        <date>August 2005</date>
         <productname>udev</productname>
       </refentryinfo>