Update runtime files.
diff --git a/runtime/doc/syntax.txt b/runtime/doc/syntax.txt
index 3ec4acf..6a9f6ae 100644
--- a/runtime/doc/syntax.txt
+++ b/runtime/doc/syntax.txt
@@ -1,4 +1,4 @@
-*syntax.txt* For Vim version 8.1. Last change: 2019 Nov 20
+*syntax.txt* For Vim version 8.1. Last change: 2019 Nov 29
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -966,10 +966,12 @@
C *c.vim* *ft-c-syntax*
A few things in C highlighting are optional. To enable them assign any value
-to the respective variable. Example: >
+(including zero) to the respective variable. Example: >
:let c_comment_strings = 1
-To disable them use ":unlet". Example: >
+ :let c_no_bracket_error = 0
+To disable them use `:unlet`. Example: >
:unlet c_comment_strings
+Setting the value to zero doesn't work!
An alternative is to switch to the C++ highlighting: >
:set filetype=cpp
@@ -985,8 +987,8 @@
except { and } in first column
Default is to highlight them, otherwise you
can't spot a missing ")".
-*c_curly_error* highlight a missing }; this forces syncing from the
- start of the file, can be slow
+*c_curly_error* highlight a missing } by finding all pairs; this
+ forces syncing from the start of the file, can be slow
*c_no_ansi* don't do standard ANSI types and constants
*c_ansi_typedefs* ... but do standard ANSI types
*c_ansi_constants* ... but do standard ANSI constants