Apply suggestions from code review

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

Author: adqm

Doc/reference/expressions.rst

@@ -433,7 +433,7 @@ produced.
 The second form uses a single expression prefixed by the ``**`` dictionary
 unpacking operator followed by the usual "for" and "if" clauses.  When the
 comprehension is run, the expression is evaluated and then unpacked, inserting
-0 or more key/value pairs into the new dictionary.
+zero or more key/value pairs into the new dictionary.
 
 Both forms of dictionary comprehension retain the property that if the same key
 is specified multiple times, the associated value in the resulting dictionary

Doc/tutorial/datastructures.rst

@@ -436,7 +436,7 @@ A tuple consists of a number of values separated by commas, for instance::
    >>> v
    ([1, 2, 3], [3, 2, 1])
    >>> # they support unpacking just like lists:
-   >>> x = [1,2,3]
+   >>> x = [1, 2, 3]
    >>> 0, *x, 4
    (0, 1, 2, 3, 4)
 

Grammar/python.gram

@@ -893,7 +893,7 @@ atom[expr_ty]:
     | 'None' { _PyAST_Constant(Py_None, NULL, EXTRA) }
     | &(STRING|FSTRING_START|TSTRING_START) strings
     | NUMBER
-    | &'(' ( genexp | tuple | group)
+    | &'(' (genexp | tuple | group)
     | &'[' (listcomp | list)
     | &'{' (dictcomp | setcomp | dict | set)
     | '...' { _PyAST_Constant(Py_Ellipsis, NULL, EXTRA) }