document two error classes related to "augment"

Author: moritz

lib/X/Syntax/Augment/Role.pod

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+=begin pod
+
+=TITLE class X::Syntax::Augment::Role
+
+    class X::Syntax::Augment::Role does X::Syntax { }
+
+Compile time error thrown when trying to agument a role.
+
+For example
+
+    use MONKEY_TYPING;
+    augment role Positional { }
+
+dies with
+
+    ===SORRY!===
+    Cannot augment role Positional, since roles are immutable
+
+=head1 Methods
+
+=head2 role-name
+
+    method role-name() returns Str:D
+
+Returns the name of the role that was attempted to augment.
+
+=end pod

lib/X/Syntax/Augment/WithoutMonkeyTyping.pod

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+=begin pod
+
+=TITLE class X::Syntax::Augment::WithoutMonkeyTyping
+
+    class X::Syntax::Augment::WithoutMonkeyTyping does X::Syntax { }
+
+Compile time error thrown when C<augment> is used without C<use MONKEY_TYPING>.
+
+Since C<augment> is considered a rather unsafe and impolate action, you have
+to pre-declare your intent with the C<use MONKEY_TYPING;> pragma.
+
+If you don't do that, for example
+
+    augment class Int { };
+
+you get the error
+
+    ===SORRY!===
+    augment not allowed without 'use MONKEY_TYPING'
+
+=end pod