Improve guard so it works for no eof new line

syntax/rhelp.vim

@@ -1,4 +1,5 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'r-lang') == -1
+
 " Vim syntax file
 " Language:    R Help File
 " Maintainer:  Johannes Ranke <jranke@uni-bremen.de>
@@ -154,4 +155,5 @@ endif
 
 let   b:current_syntax = "rhelp"
 " vim: foldmethod=marker:
+
 endif