Update runtime files.
diff --git a/runtime/doc/map.txt b/runtime/doc/map.txt
index 08861a8..55c9c12 100644
--- a/runtime/doc/map.txt
+++ b/runtime/doc/map.txt
@@ -1,4 +1,4 @@
-*map.txt* For Vim version 8.2. Last change: 2019 Nov 09
+*map.txt* For Vim version 8.2. Last change: 2019 Dec 19
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -1044,7 +1044,8 @@
See |:map-<buffer>| for the optional <buffer> argument.
*:una* *:unabbreviate*
-:una[bbreviate] {lhs} Remove abbreviation for {lhs} from the list. If none
+:una[bbreviate] [<buffer>] {lhs}
+ Remove abbreviation for {lhs} from the list. If none
is found, remove abbreviations in which {lhs} matches
with the {rhs}. This is done so that you can even
remove abbreviations after expansion. To avoid
@@ -1059,7 +1060,8 @@
Same as ":ab", but for Command-line mode only.
*:cuna* *:cunabbrev*
-:cuna[bbrev] {lhs} Same as ":una", but for Command-line mode only.
+:cuna[bbrev] [<buffer>] {lhs}
+ Same as ":una", but for Command-line mode only.
*:cnorea* *:cnoreabbrev*
:cnorea[bbrev] [<expr>] [<buffer>] [lhs] [rhs]
@@ -1071,7 +1073,8 @@
Same as ":ab", but for Insert mode only.
*:iuna* *:iunabbrev*
-:iuna[bbrev] {lhs} Same as ":una", but for insert mode only.
+:iuna[bbrev] [<buffer>] {lhs}
+ Same as ":una", but for insert mode only.
*:inorea* *:inoreabbrev*
:inorea[bbrev] [<expr>] [<buffer>] [lhs] [rhs]