Update intro.pod6

Perl6 -> Perl 6
section name changed to Sentence case.

doc/Language/intro.pod6

@@ -25,7 +25,7 @@ presentations, and videos.
 
 It has been found that newcommers to Perl 6 often ask questions that indicate
 assumptions carried over from other programming paradigms. It is suggested that
-the following sections in the FUNDAMENTAL TOPICS section should be reviewed
+the following sections in the C<Fundamental topics> section should be reviewed
 first.
 
 =begin item
@@ -42,11 +42,11 @@ in a container. So, for example, a $scaler container can contain an object that
 =end item
 
 =begin item
-L<C<Classes and Roles>|/language/classtut> - Perl6 is fundamentally based on objects, which are described
-in terms of classes and roles. Perl6, unlike some languages, does not
-B<impose> object-oriented programming practices, and useful programs can be written as if Perl6 was purely procedural in
-nature. However, complex software, such as the Perl6 compiler itself, is made much simpler by writing in object-oriented idioms,
-which is why the Perl6 documentation is more easily understood by reviewing what a class is and what a role is. Without understanding
+L<C<Classes and Roles>|/language/classtut> - Perl 6 is fundamentally based on objects, which are described
+in terms of classes and roles. Perl 6, unlike some languages, does not
+B<impose> object-oriented programming practices, and useful programs can be written as if Perl 6 was purely procedural in
+nature. However, complex software, such as the Rakudo compiler of Perl 6, is made much simpler by writing in object-oriented idioms,
+which is why the Perl 6 documentation is more easily understood by reviewing what a class is and what a role is. Without understanding
 about Classes and Roles, it would be difficult to understand Types, to which a whole section of the documentation is devoted.
 =end item