Fix formatting of syntax description of function definition.
diff --git a/Doc/reference/compound_stmts.rst b/Doc/reference/compound_stmts.rst
index 003224b..6889176 100644
--- a/Doc/reference/compound_stmts.rst
+++ b/Doc/reference/compound_stmts.rst
@@ -442,8 +442,7 @@
decorator: "@" `dotted_name` ["(" [`parameter_list` [","]] ")"] NEWLINE
dotted_name: `identifier` ("." `identifier`)*
parameter_list: (`defparameter` ",")*
- : ( "*" [`parameter`] ("," `defparameter`)*
- : [, "**" `parameter`]
+ : ( "*" [`parameter`] ("," `defparameter`)* ["," "**" `parameter`]
: | "**" `parameter`
: | `defparameter` [","] )
parameter: `identifier` [":" `expression`]