Clean up into reference to "containers"

Author: coke

doc/Language/intro.rakudoc

@@ -33,10 +33,12 @@ explicitly in the text.
 =begin item
 L<C<Containers>|/language/containers> - Variables, which are like the nouns of
 a computer language, are containers in which information is stored. The first
-letter in the formal name of a container, such as the C<$> of C<$my-variable>, or
-C<@> of C<@an-array-of-things>, or C<%> of C<%the-scores-in-the-competition>, conveys
-information about the container. It should be noted, however, that you can store an
-L<C<Array>|/type/Array> in a C<$> container and treat it as a single object.
+character in the name of a container, called a sigil, conveys information about
+the container.  For example, the C<$> of C<$my-variable>, or
+C<@> of C<@an-array-of-things>, or C<%> of C<%scores-by-name>,
+
+I<Note you can store an
+L<C<Array>|/type/Array> in a C<$> container and treat it as a single object.>
 =end item
 
 =begin item