Update usr_27 from Vim 8.0 to 8.1

Author: mnishz

doc/usr_27.jax

@@ -1,4 +1,4 @@
-*usr_27.txt*	For Vim バージョン 8.0.  Last change: 2010 Mar 28
+*usr_27.txt*	For Vim バージョン 8.1.  Last change: 2018 Jan 26
 
 		     VIM USER MANUAL - by Bram Moolenaar
 

en/usr_27.txt

@@ -1,4 +1,4 @@
-*usr_27.txt*	For Vim version 8.0.  Last change: 2010 Mar 28
+*usr_27.txt*	For Vim version 8.1.  Last change: 2018 Jan 26
 
 		     VIM USER MANUAL - by Bram Moolenaar
 
@@ -225,9 +225,9 @@ specify a line offset, this can cause trouble.  For example: >
 	/const/-2
 
 This finds the next word "const" and then moves two lines up.  If you
-use "n" to search again, Vim could start at the current position and find the same
-"const" match.  Then using the offset again, you would be back where you started.
-You would be stuck!
+use "n" to search again, Vim could start at the current position and find the
+same "const" match.  Then using the offset again, you would be back where you
+started.  You would be stuck!
    It could be worse: Suppose there is another match with "const" in the next
 line.  Then repeating the forward search would find this match and move two
 lines up.  Thus you would actually move the cursor back!