Added Introspection section to Scalar

Specifically the "name", "default" and "dynamic" methods were not documented
yet.  And the "of" was buried in documentation about atomic ops.  Felt right
to create a separate Introspection section

Author: lizmat

doc/Type/Scalar.pod6

@@ -109,6 +109,52 @@ Therefore, there would be a race to do that binding. The C<Scalar> atomic
 operations will never check for or do any such auto-vivification, so as to
 make such bugs much more evident (rather than only observed under stress).
 
+=head1 Introspection
+
+=head2 method of
+
+    method of(Scalar:D: --> Mu)
+
+Returns the type constraint of the container.
+
+Example:
+
+    my Cool $x = 42;
+    say $x.VAR.of;                  # OUTPUT: «(Cool)»
+
+=head2 method default
+
+    method default(Scalar:D: --> Str)
+
+Returns the default value associated with the container.
+
+Example:
+
+    my $x is default(666) = 42;
+    say $x.VAR.default;             # OUTPUT: «666»
+
+=head2 method name
+
+    method name(Scalar:D: --> Str)
+
+Returns the name associated with the container.
+
+Example:
+
+    my $x = 42;
+    say $x.VAR.name;                # OUTPUT: «$x»
+
+=head2 method dynamic
+
+    method dynamic(Scalar:D: --> Bool)
+
+Returns whether the variable is visible in dynamic variable lookups.
+
+Example:
+
+    my $*FOO = 42;
+    say $*FOO.VAR.dynamic;          # OUTPUT: «True»
+
 =head1 Routines
 
 =head2 atomic-assign
@@ -207,17 +253,6 @@ manner as follows:
 This will reliably build up a linked list of 4000 items, with 4 nodes with
 each value ranging from 0 up to 999.
 
-=head2 method of
-
-    method of(Scalar:D: --> Mu)
-
-Returns the type constraint of the container.
-
-Example:
-
-    my Cool $x = 42;
-    say $x.VAR.of.^name;            # OUTPUT: «Cool»
-
 =head1 Operators
 
 =head2 infix ⚛=