patch 8.1.2096: too many #ifdefs

Problem:    Too many #ifdefs.
Solution:   Graduate FEAT_COMMENTS.
diff --git a/runtime/doc/change.txt b/runtime/doc/change.txt
index 345bc8f..542d972 100644
--- a/runtime/doc/change.txt
+++ b/runtime/doc/change.txt
@@ -1618,8 +1618,6 @@
 "#include" is not recognized as a comment line.  But a line that starts with
 "# define" is recognized.  This is a compromise.
 
-{not available when compiled without the |+comments| feature}
-
 							*fo-table*
 You can use the 'formatoptions' option  to influence how Vim formats text.
 'formatoptions' is a string that can contain any of the letters below.  The
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index d216f0c..cb65535 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -1685,8 +1685,6 @@
 'comments' 'com'	string	(default
 				"s1:/*,mb:*,ex:*/,://,b:#,:%,:XCOMM,n:>,fb:-")
 			local to buffer
-			{not available when compiled without the |+comments|
-			feature}
 	A comma separated list of strings that can start a comment line.  See
 	|format-comments|.  See |option-backslash| about using backslashes to
 	insert a space.
diff --git a/runtime/doc/various.txt b/runtime/doc/various.txt
index f251613..8f3d946 100644
--- a/runtime/doc/various.txt
+++ b/runtime/doc/various.txt
@@ -1,4 +1,4 @@
-*various.txt*   For Vim version 8.1.  Last change: 2019 Sep 04
+*various.txt*   For Vim version 8.1.  Last change: 2019 Sep 28
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -337,7 +337,7 @@
 T  *+cmdline_compl*	command line completion |cmdline-completion|
 S  *+cmdline_hist*	command line history |cmdline-history|
 N  *+cmdline_info*	|'showcmd'| and |'ruler'|
-N  *+comments*		|'comments'| support
+T  *+comments*		|'comments'| support
 B  *+conceal*		"conceal" support, see |conceal| |:syn-conceal| etc.
 N  *+cryptv*		encryption support |encryption|
 B  *+cscope*		|cscope| support