use sentence case

Author: tbrowder

doc/Language/pod.pod6

@@ -1,10 +1,10 @@
 =begin pod :tag<perl6> :page-order<a45>
 
-=TITLE Perl 6 Pod
+=TITLE Perl 6 pod
 
 =SUBTITLE An easy-to-use markup language
 
-Perl 6 Pod is an easy-to-use markup language. Pod can be used for writing language
+Perl 6 pod is an easy-to-use markup language. Pod can be used for writing language
 documentation, for documenting programs and modules, as well as for
 other types of document composition.