Revert "Backport change from r115807 in Emacs trunk"

This reverts commit c2ed678f20f7a4deccc3373c6a226163d5624cc8.

doc/org.texi

@@ -16,8 +16,6 @@
 @set MAINTAINER Carsten Dominik
 @set MAINTAINEREMAIL @email{carsten at orgmode dot org}
 @set MAINTAINERCONTACT @uref{mailto:carsten at orgmode dot org,contact the maintainer}
-@documentencoding UTF-8
-@documentlanguage en
 @c %**end of header
 @finalout