patch 8.1.1068: cannot get all the information about current completion

Problem:    Cannot get all the information about current completion.
Solution:   Add complete_info(). (Shougo, Hirohito Higashi, closes #4106)
diff --git a/runtime/doc/insert.txt b/runtime/doc/insert.txt
index bd4fad2..b747abe 100644
--- a/runtime/doc/insert.txt
+++ b/runtime/doc/insert.txt
@@ -1,4 +1,4 @@
-*insert.txt*    For Vim version 8.1.  Last change: 2019 Jan 29
+*insert.txt*    For Vim version 8.1.  Last change: 2019 Mar 26
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -379,8 +379,8 @@
 CTRL-L		when 'insertmode' is set: go to Normal mode  *i_CTRL-L*
 CTRL-G u	break undo sequence, start new change	     *i_CTRL-G_u*
 CTRL-G U	don't break undo with next left/right cursor *i_CTRL-G_U*
-		movement (but only if the cursor stays
-		within same the line)
+		movement, if the cursor stays within
+		same the line
 -----------------------------------------------------------------------
 
 Note: If the cursor keys take you out of Insert mode, check the 'noesckeys'
@@ -642,6 +642,7 @@
 not a valid CTRL-X mode command.  Valid keys are the CTRL-X command itself,
 CTRL-N (next), and CTRL-P (previous).
 
+To get the current completion information, |complete_info()| can be used.
 Also see the 'infercase' option if you want to adjust the case of the match.
 
 							*complete_CTRL-E*