patch 8.1.1901: the +insert_expand feature is not always available

Problem:    The +insert_expand feature is not always available.
Solution:   Graduate the +insert_expand feature.
diff --git a/runtime/doc/change.txt b/runtime/doc/change.txt
index 4c87726..dc9acca 100644
--- a/runtime/doc/change.txt
+++ b/runtime/doc/change.txt
@@ -691,10 +691,8 @@
 	    <Esc>   to quit substituting
 	    'a'	    to substitute this and all remaining matches
 	    'q'	    to quit substituting
-	    CTRL-E  to scroll the screen up {not available when compiled
-		       without the |+insert_expand| feature}
-	    CTRL-Y  to scroll the screen down {not available when compiled
-		       without the |+insert_expand| feature}
+	    CTRL-E  to scroll the screen up
+	    CTRL-Y  to scroll the screen down
 	If the 'edcompatible' option is on, Vim remembers the [c] flag and
 	toggles it each time you use it, but resets it when you give a new
 	search pattern.
diff --git a/runtime/doc/index.txt b/runtime/doc/index.txt
index f6cf2b5..091ffb2 100644
--- a/runtime/doc/index.txt
+++ b/runtime/doc/index.txt
@@ -1,4 +1,4 @@
-*index.txt*     For Vim version 8.1.  Last change: 2019 Aug 16
+*index.txt*     For Vim version 8.1.  Last change: 2019 Aug 21
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -166,7 +166,6 @@
 |i_CTRL-X_CTRL-V|	CTRL-X CTRL-V	complete like in : command line
 |i_CTRL-X_CTRL-]|	CTRL-X CTRL-]	complete tags
 |i_CTRL-X_s|		CTRL-X s	spelling suggestions
-{not available when compiled without the |+insert_expand| feature}
 
 commands in completion mode (see |popupmenu-keys|)
 
diff --git a/runtime/doc/insert.txt b/runtime/doc/insert.txt
index 8ba360b..87407e1 100644
--- a/runtime/doc/insert.txt
+++ b/runtime/doc/insert.txt
@@ -300,8 +300,7 @@
 
 						*i_CTRL-X* *insert_expand*
 CTRL-X enters a sub-mode where several commands can be used.  Most of these
-commands do keyword completion; see |ins-completion|.  These are not available
-when Vim was compiled without the |+insert_expand| feature.
+commands do keyword completion; see |ins-completion|.
 
 Two commands can be used to scroll the window up or down, without exiting
 insert mode:
@@ -609,9 +608,6 @@
 keyword or line that has been typed.  This is useful if you are using
 complicated keywords (e.g., function names with capitals and underscores).
 
-These commands are not available when the |+insert_expand| feature was
-disabled at compile time.
-
 Completion can be done for:
 
 1. Whole lines						|i_CTRL-X_CTRL-L|
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index caca308..e5ad114 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -1,4 +1,4 @@
-*options.txt*	For Vim version 8.1.  Last change: 2019 Aug 18
+*options.txt*	For Vim version 8.1.  Last change: 2019 Aug 21
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -1866,7 +1866,7 @@
 'completefunc' 'cfu'	string	(default: empty)
 			local to buffer
 			{not available when compiled without the |+eval|
-			or |+insert_expand| features}
+			feature}
 	This option specifies a function to be used for Insert mode completion
 	with CTRL-X CTRL-U. |i_CTRL-X_CTRL-U|
 	See |complete-functions| for an explanation of how the function is
@@ -1892,8 +1892,6 @@
 						*'completeopt'* *'cot'*
 'completeopt' 'cot'	string	(default: "menu,preview")
 			global
-			{not available when compiled without the
-			|+insert_expand| feature}
 	A comma separated list of options for Insert mode completion
 	|ins-completion|.  The supported values are:
 
@@ -5233,8 +5231,6 @@
 
 	In the "popup" model the right mouse button produces a pop-up menu.
 	You need to define this first, see |popup-menu|.
-	In a terminal the popup menu works if Vim is compiled with the
-	|+insert_expand| option.
 
 	Note that you can further refine the meaning of buttons with mappings.
 	See |gui-mouse-mapping|.  But mappings are NOT used for modeless
@@ -5419,7 +5415,7 @@
 'omnifunc' 'ofu'	string	(default: empty)
 			local to buffer
 			{not available when compiled without the |+eval|
-			or |+insert_expand| features}
+			feature}
 	This option specifies a function to be used for Insert mode omni
 	completion with CTRL-X CTRL-O. |i_CTRL-X_CTRL-O|
 	See |complete-functions| for an explanation of how the function is
@@ -5749,8 +5745,6 @@
 						*'pumheight'* *'ph'*
 'pumheight' 'ph'	number	(default 0)
 			global
-			{not available when compiled without the
-			|+insert_expand| feature}
 	Determines the maximum number of items to show in the popup menu for
 	Insert mode completion.  When zero as much space as available is used.
 	|ins-completion-menu|.
@@ -5758,8 +5752,6 @@
 						*'pumwidth'* *'pw'*
 'pumwidth' 'pw'		number	(default 15)
 			global
-			{not available when compiled without the
-			|+insert_expand| feature}
 	Determines the minimum width to use for the popup menu for Insert mode
 	completion.  |ins-completion-menu|.