man: Fix NAME section

podchecker(1) complained about these, eg.

  *** WARNING: Verbatim paragraph in NAME section at line 3 in
               file tools/virt-host-validate.pod

tools/virt-host-validate.pod

 =head1 NAME
 
-  virt-host-validate - validate host virtualization setup
+virt-host-validate - validate host virtualization setup
 
 =head1 SYNOPSIS
 

tools/virt-pki-validate.pod

 =head1 NAME
 
-  virt-pki-validate - validate libvirt PKI files are configured correctly
+virt-pki-validate - validate libvirt PKI files are configured correctly
 
 =head1 SYNOPSIS
 

tools/virt-sanlock-cleanup.pod

 =head1 NAME
 
-  virt-sanlock-cleanup - remove stale sanlock resource lease files
+virt-sanlock-cleanup - remove stale sanlock resource lease files
 
 =head1 SYNOPSIS
 

tools/virt-xml-validate.pod

 =head1 NAME
 
-  virt-xml-validate - validate libvirt XML files against a schema
+virt-xml-validate - validate libvirt XML files against a schema
 
 =head1 SYNOPSIS