incorporate fixes from Pm; answer Pm's questions

docs/review-notes.txt

@@ -2,15 +2,24 @@ Pm-1:  (basics) The first example uses C<.split> (e.g. to get the list
     of names), but in Perl 6 the canonical way to grab a list
     of words is via C<.comb>.  Should we switch?
 
+perlpilot: I don't think so.  C<.comb> takes a regex to describe
+           what you want and it's too soon and potentially
+           confusing to bring those up.
+
 Pm-2:  (basics) Footnote 1 -- I'd reword as "Unlike in Perl 5, in Perl 6
     the sigil does not change when accessing an array or hash
     using C<[ ]> or C<{ }>.  This is called I<sigil invariance>."
 
+perlpilot: reworded mostly the same.
+
 Pm-3:  (basics) I know it's a bit early to talk about Junctions, but
     for the answer to problem #2 it might be better to say
 
          unless all($p1, $p2) ~~ @names { ... }
 
+perlpilot: Definitely not.  We don't talk about Junctions B<at all> in
+           the book yet  :)
+
 Pm-4:  (operators)  The &infix:<,> operator doesn't construct a C<List>,
     and C<List>s are no longer immutable.
 

src/basics.pod

@@ -160,14 +160,13 @@ an C<Array>.  Arrays store ordered lists.
 
 X<hash>
 
-These two lines of code declare two hashes.  The C<%> sigil marks each variable 
-as a C<Hash>.  A C<Hash> is an unordered
-collection of pairs of keys and values. Other programming languages call that a
-I<hash table>, I<dictionary>, or I<map>. You can query a hash table for the
-value that corresponds to a certain C<$key> with C<%hash{$key}>N<
-Perl 5 programmers will notice that in Perl 6 the sigil stays the same
-and does not change upon indexing with C<[ ]> or C<{ }>. This
-is referred to as I<M<sigil invariance>>.>.
+These two lines of code declare two hashes.  The c<%> sigil marks each
+variable as a C<Hash>.  A C<Hash> is an unordered collection of pairs of
+keys and values.  Other programming languages call that a I<hash table>,
+I<dictionary>, or I<map>.  You can query a hash table for the value that
+corresponds to a certain C<$key> with C<%hash{$key}>N<Unlike Perl 5, in
+Perl 6 the sigil does not change when accessing an array or hash with
+C<[ ]> or C<{ }>. This is called I<M<sigil invariance>>.>.
 
 In the score counting program, C<%matches> stores the number of matches each
 player has won.  C<%sets> stores the number of sets each player has won.