bpo-42485: [Doc] Link to PEP 617 from full grammar specification (GH-23532)

SnoopJ · lysnikolaou · web-flow · commit bcc957922757 · 2020-11-30T19:08:26.000Z
Co-authored-by: Lysandros Nikolaou &lt;lisandrosnik@gmail.com&gt;
diff --git a/Doc/reference/grammar.rst b/Doc/reference/grammar.rst
@@ -13,7 +13,8 @@ In particular, ``&`` followed by a symbol, token or parenthesized
 group indicates a positive lookahead (i.e., is required to match but
 not consumed), while ``!`` indicates a negative lookahead (i.e., is
 required _not_ to match).  We use the ``|`` separator to mean PEG's
-"ordered choice" (written as ``/`` in traditional PEG grammars).
+"ordered choice" (written as ``/`` in traditional PEG grammars). See
+:pep:`617` for more details on the grammar's syntax.
 
 .. literalinclude:: ../../Grammar/python.gram
   :language: peg
