patch 9.0.0826: if 'endofline' is set CTRL-Z may be written in a wrong place

Problem:    If 'endofline' is set the CTRL-Z may be written in the wrong
            place.
Solution:   Write CTRL-Z at the end of the file.  Update the help to explain
            the possibilities better. (Ken Takata, closes #11486)
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 0a4df61..bdc473d 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -3056,6 +3056,7 @@
 	When writing a file and this option is off and the 'binary' option
 	is on, or 'fixeol' option is off, no CTRL-Z will be written at the
 	end of the file.
+	See |eol-and-eof| for example settings.
 
 			*'endofline'* *'eol'* *'noendofline'* *'noeol'*
 'endofline' 'eol'	boolean	(default on)
@@ -3071,6 +3072,7 @@
 	to remember the presence of a <EOL> for the last line in the file, so
 	that when you write the file the situation from the original file can
 	be kept.  But you can change it if you want to.
+	See |eol-and-eof| for example settings.
 
 			     *'equalalways'* *'ea'* *'noequalalways'* *'noea'*
 'equalalways' 'ea'	boolean	(default on)
@@ -3466,6 +3468,7 @@
 	When the 'binary' option is set the value of this option doesn't
 	matter.
 	See the 'endofline' option.
+	See |eol-and-eof| for example settings.
 
 					*'fkmap'* *'fk'* *'nofkmap'* *'nofk'*
 'fkmap' 'fk'		boolean (default off)