Fix POD in several perl modules to avoid two consecutive lines starting with =item

An empty line is required between the two or pod2man decides that the
second is the continuation of the former and includes "=item" in the
generated manual page.

scripts/Dpkg/Changelog/Entry.pm

@@ -69,6 +69,7 @@ sub new {
 }
 
 =item my $str = $entry->output()
+
 =item "$entry"
 
 Get a string representation of the changelog entry.

scripts/Dpkg/Control/Info.pm

@@ -113,6 +113,7 @@ sub parse {
 }
 
 =item $c->[0]
+
 =item $c->get_source()
 
 Returns a Dpkg::Control object containing the fields concerning the

scripts/Dpkg/Deps.pm

@@ -1067,6 +1067,7 @@ This object represents a list of relationships.
 The output method uses ", " to join the list of relationships.
 
 =item $union->implies($other_dep)
+
 =item $union->get_evaluation($other_dep)
 
 Those methods are not meaningful for this object and always return undef.

scripts/Dpkg/Index.pm

@@ -315,6 +315,7 @@ sub sort {
 }
 
 =item my $str = $index->output()
+
 =item "$index"
 
 Get a string representation of the index. The Dpkg::Control objects are

scripts/Dpkg/Version.pm

@@ -343,6 +343,7 @@ sub version_split_digits($) {
 }
 
 =item my ($ok, $msg) = version_check($version)
+
 =item my $ok = version_check($version)
 
 Checks the validity of $version as a version number. Returns 1 in $ok