[flang] Add documentation.

Original-commit: flang-compiler/f18@4114c9e695ff740199ec015a041be3ac0fa8b779
Reviewed-on: https://github.com/flang-compiler/f18/pull/38
Tree-same-pre-rewrite: false

diff --git a/flang/documentation/parsing.md b/flang/documentation/parsing.md
index ef1e756..f10ff76 100644 (file)
--- a/flang/documentation/parsing.md
+++ b/flang/documentation/parsing.md
@@ -118,10 +118,11 @@ Messages
 --------
 Message texts, and snprintf-like formatting strings for constructing
 messages, are instantiated in the various components of the parser with
-C++ user defined character literals tagged with `_en_US` (signifying
-the dialect of English used in the United States) so that they may be
-easily identified for localization.  As described above, messages are
-associated with source code positions by means of provenance values.
+C++ user defined character literals tagged with `err_en_US` and `_en_US`
+(signifying fatality and language, with the default being the dialect of
+English used in the United States) so that they may be easily identified
+for localization.  As described above, messages are associated with
+source code positions by means of provenance values.
 
 The Parse Tree
 --------------