Minor changes and reflow

doc/Language/py-nutshell.pod6

@@ -316,11 +316,11 @@ Perl 6
 Using C<if> as a statement modifier (as above) is acceptable
 in Perl 6, even outside of a list comprehension.
 
-The C<yield> statement in Python which produces a
-C<generator> is like a C<gather>, C<take> construct
-in Perl 6.  These both print 1, 2, 3.
+The C<yield> statement within a C<for> loop in Python, which produces a
+C<generator>, is like a C<gather>/C<take> construct in Perl 6.  These both print
+1, 2, 3.
 
-Python
+I<Python>
 
 =begin code :lang<python>
 def count():
@@ -331,7 +331,7 @@ for c in count():
     print c
 =end code
 
-Perl 6
+I<Perl 6>
 
     sub count {
         gather {