Reindexes with orwith without

Also some rephrasing here and there. Closes #2633
Apparently the problem was it was indexing from a secondary page and creating a tertiary page. Indexing is always mysterious.

Author: JJ

doc/Language/control.pod6

@@ -6,7 +6,7 @@
 
 =head1 X<statements|control flow, statements>
 
-Perl 6 programs consists of one or more statements.  Simple statements
+Perl 6 programs consist of one or more statements.  Simple statements
 are separated by semicolons.  The following program will say "Hello"
 and then say "World" on the next line.
 
@@ -327,7 +327,10 @@ unless 0 { "0 is false".say }  ; # says "0 is false"
     my $c = 0; say (1, (unless 0 { $c += 42; 2; }), 3, $c); # says "(1 2 3 42)"
     my $d = 0; say (1, (unless 1 { $d += 42; 2; }), 3, $d); # says "(1 3 0)"
 
-=head2 X<with, orwith, without|control flow,with orwith without>
+X<with|control flow,with>
+X<orwith|control flow,orwith>
+X<without|control flow,without>
+=head2 C<with>, C<orwith>, C<without>
 
 The C<with> statement is like C<if> but tests for definedness rather than
 truth.  In addition, it topicalizes on the condition, much like C<given>:
@@ -367,8 +370,8 @@ an outer block; they also both have a "statement modifier" form. But there is a
 difference in how following code in the same, outer block is handled: When the
 C<when> block is executed, control is passed to the enclosing block and
 following statements are ignored; but when the C<if> block is executed,
-following statements are executed. N<There are other ways to modify the
-default behavior of each which are discussed in other sections.> The following
+following statements are executed. N<There are other ways to modify their
+default behavior; they are discussed in other sections.> The following
 examples should illustrate the C<if> or C<when> block's default behavior
 assuming no special exit or other side effect statements are included in the
 C<if> or C<when> blocks: