attempt to clarify some wording in 'How to Teach This'

Author: adqm

peps/pep-0798.rst

@@ -580,15 +580,16 @@ expressions that involve unpacking::
             yield from expr
     g = generator()
 
-We can then generalize from these specific examples to the idea that,
-wherever a non-starred comprehension/genexp would use an operator that
-adds a single element to a collection, the starred would instead use
-an operator that adds multiple elements to that collection.
+We can then generalize from these specific examples to the idea that, wherever
+a non-starred comprehension/genexp would use an operator that adds a single
+element to a collection, the starred would instead use an operator that adds
+multiple elements to that collection.
 
 Alternatively, we don't need to think of the two ideas as separate; instead,
 with the new syntax, we can think of ``out = [...x... for x in it]`` as
-equivalent to the following code [#pep798-guido]_, regardless of whether or not
-``...x...`` uses ``*``::
+equivalent to the following code [#pep798-guido]_ (where ``...x...`` is a
+stand-in for an arbitrary expression), regardless of whether or not ``...x...``
+uses ``*``::
 
     out = []
     for x in it: