Update runtime files

runtime/doc/syntax.txt

@@ -1,4 +1,4 @@
-*syntax.txt*	For Vim version 8.1.  Last change: 2019 Nov 14
+*syntax.txt*	For Vim version 8.1.  Last change: 2019 Nov 20
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -2771,10 +2771,10 @@ To set a user-defined list of code block syntax highlighting: >
 To assign multiple code block types to a single syntax, define
 `rst_syntax_code_list` as a mapping: >
 	let rst_syntax_code_list = {
-		\ 'cpp' = ['cpp', 'c++'],
-                \ 'bash' = ['bash', 'sh'],
+		\ 'cpp': ['cpp', 'c++'],
+		\ 'bash': ['bash', 'sh'],
 		...
-	}
+	\ }
 
 To use color highlighting for emphasis text: >
 	let rst_use_emphasis_colors = 1