bpo-40204: Fix duplicated productionlist names in the doc (GH-21900)
Sphinx 3 disallows having more than one productionlist markup with
the same name. Simply remove names in this case, since names are not
shown anyway. For example, fix the Sphinx 3 warning:
Doc/reference/introduction.rst:96: duplicate token description
of *:name, other instance in reference/expressions
diff --git a/Doc/reference/introduction.rst b/Doc/reference/introduction.rst
index bb7e390..62480bd 100644
--- a/Doc/reference/introduction.rst
+++ b/Doc/reference/introduction.rst
@@ -93,7 +93,7 @@
The descriptions of lexical analysis and syntax use a modified BNF grammar
notation. This uses the following style of definition:
-.. productionlist:: *
+.. productionlist::
name: `lc_letter` (`lc_letter` | "_")*
lc_letter: "a"..."z"