util/mkpod2html.pl: Fix unbalanced quotes

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11969)

util/mkpod2html.pl

diff --git a/util/mkpod2html.pl b/util/mkpod2html.pl
index 9e81d36..2df4b22 100755
--- a/util/mkpod2html.pl
+++ b/util/mkpod2html.pl
@@ -45,7 +45,7 @@
 unlink $opt_o;
 
 $contents =~
-    s|href="http://man\.he\.net/(man\d/[^"]+)(?:\.html)?"|href="../$1.html|g;
+    s|href="http://man\.he\.net/(man\d/[^"]+)(?:\.html)?"|href="../$1.html"|g;
 open F, ">$opt_o"
     or die "Can't write $opt_o, $!";
 print F $contents;