Clarifies variable name interpolation

Using both mechanism: via <> and via ::().

doc/Language/syntax.pod6

@@ -264,26 +264,33 @@ Identifiers can contain colon pairs. The entire colon pair becomes part
 of the name of the identifier.
 
     my $foo::bar = 1;
-    my $foo:bar<2> = 2;
     say MY::.keys;
     # OUTPUT: «($=pod !UNIT_MARKER EXPORT $_ $! ::?PACKAGE
     #          GLOBALish $¢ $=finish $/ $foo:bar $foo:bar<2>
     #          $?PACKAGE)␤»
     say OUR::.key; # OUTPUT: «foo␤»
 
 The last sentence shows how the C<foo> package has been created
-automatically, as a deposit for variables in that namespace. Colon pairs
-in identifiers support interpolation. Please note that resolution of
+automatically, as a deposit for variables in that namespace.
+
+Identifiers can also contain single colons, and in that case they can
+add I<symbols> within angle brackets. This is a mechanism that supports
+interpolation; which is also supported by colonpairs if the interpolated
+variable is inserted in parentheses. Please note that resolution of
 names often happens at compile time, so interpolation values must be
 known at compile time.
 
+    my $foo:bar<2> = 2;
     constant $c = 42;
     my $a:foo<42> = "answer";
-    say $a:foo«$c»;
-    # OUTPUT: «answer␤»
-
-Unicode superscript numerals are exponents and not part of an identifier;
-e.g. C<$x²> does the square of variable C<$x>.  Subscript numerals are TBD.
+    say $a:foo«$c»;    # OUTPUT: «answer␤»
+    my $buz = "qux";
+    my $bur::quux = 7;
+    say $bur::($buz);  # OUTPUT: «7␤»
+
+Unicode superscript numerals are exponents and not part of an
+identifier; e.g. C<$x²> does the square of variable C<$x>.  Subscript
+numerals are TBD.
 
 =head2 Term term:<>