Cleanup some old perl6 references.

Part of #751

README.pod

@@ -102,10 +102,10 @@ B<NOTE:> there's B<no end-user support> for NQP and the behaviour can
 change without notice. It's a tool for writing Raku compilers, not a
 low-level module for Raku programmers.
 
-The L<examples directory|https://github.com/perl6/nqp/tree/master/examples> is a good place to start, with the
-L<loops|https://github.com/perl6/nqp/blob/master/examples/loops.nqp> and other files. Opcodes are listed in
-L<the docs directory|https://github.com/perl6/nqp/blob/master/docs/ops.markdown>. NQP also has built-in routines
-listed in L<the docs directory|https://github.com/perl6/nqp/blob/master/docs/built-ins.md>. You can use NQP from this
+The L<examples directory|https://github.com/raku/nqp/tree/master/examples> is a good place to start, with the
+L<loops|https://github.com/raku/nqp/blob/master/examples/loops.nqp> and other files. Opcodes are listed in
+L<the docs directory|https://github.com/raku/nqp/blob/master/docs/ops.markdown>. NQP also has built-in routines
+listed in L<the docs directory|https://github.com/raku/nqp/blob/master/docs/built-ins.md>. You can use NQP from this
 release, it will be already installed if you have built Raku from
 scratch.
 

docs/qast.markdown

@@ -18,7 +18,7 @@ QAST::CompUnit incorporates information that is relevant to the entire
 unit of code that is being compiled. This includes:
 
 * **hll** - the name of the high level language that this QAST tree was
-  produced from, for example, "perl6", "tcl", "bf".
+  produced from, for example, "raku", "tcl", "bf".
 
 * **load** - code to evaluate at the point that the compilation unit is
   loaded as a module (but not if it is invoked as a mainline program).
@@ -32,7 +32,7 @@ Example usage:
 
     QAST::CompUnit.new(
         # Set the HLL.
-        :hll('perl6'),
+        :hll('raku'),
         
         # This variable contains the outermost QAST::Block of the
         # program.

examples/CallFromJava.java

@@ -1,7 +1,7 @@
 // nqp$ javac -cp bin/ examples/CallFromJava.java
 // nqp$ java -cp nqp-runtime.jar:3rdparty/asm/asm-4.1.jar:3rdparty/asm/asm-tree-4.1.jar:. examples.CallFromJava nqp.jar nqp 'say(2+2)'
 // 4
-// rakudo$ java -cp ../nqp-jvm:../nqp-jvm/3rdparty/asm/asm-4.1.jar:../nqp-jvm/3rdparty/asm/asm-tree-4.1.jar:../nqp-jvm/nqp-runtime.jar:rakudo-runtime.jar:. examples.CallFromJava perl6.jar perl6 'say 2 + 2'
+// rakudo$ java -cp ../nqp-jvm:../nqp-jvm/3rdparty/asm/asm-4.1.jar:../nqp-jvm/3rdparty/asm/asm-tree-4.1.jar:../nqp-jvm/nqp-runtime.jar:rakudo-runtime.jar:. examples.CallFromJava raku.jar raku 'say 2 + 2'
 // 4
 
 

examples/use-classes.nqp

@@ -2,7 +2,7 @@
 
 # based on blog post by Andrew Shitov:
 #
-#   https://perl6.online/2018/01/09/what-does-nqpgetattr-do/
+#   https://andrewshitov.com/2018/01/09/what-does-nqpgetattr-do/
 #
 #   class C {
 #       has $.attr is rw;

t/nqp/060-bigint.t

@@ -101,7 +101,7 @@ ok(iseq(nqp::bitand_I(nqp::fromstr_I('-1073741825', $one), $one, $one), 1),
     'Bit ops (RT 109740)');
 
 # Now we'll create a type that boxes a P6bigint.
-my $bi_boxer := NQPClassHOW.new_type(:name('TestPerl6Int'), :repr('P6opaque'));
+my $bi_boxer := NQPClassHOW.new_type(:name('TestRakuInt'), :repr('P6opaque'));
 $bi_boxer.HOW.add_attribute($bi_boxer, NQPAttribute.new(
     :name('$!value'), :type($bi_type), :box_target(1)
 ));
@@ -305,6 +305,6 @@ if nqp::getcomp('nqp').backend.name eq 'js' {
     skip("skipping test that uses a 64bit int on a 32bit backend");
 }
 else {
-    # https://github.com/perl6/nqp/issues/363
+    # https://github.com/raku/nqp/issues/363
     ok(100000000000000009 != 100000000000000016, 'int literals that are the same float value are unequal');
 }

tools/find-undocumented-ops.raku

@@ -1,4 +1,4 @@
-#!/usr/bin/env perl6
+#!/usr/bin/env raku
 sub MAIN (Str:D $nqp-folder, Str:D $moar-folder, Bool :$moar-names, Bool :$moar-and-nqp-names) {
     my $nqp-doc-file = make-io($nqp-folder, "docs/ops.markdown");
     my $moar-oplist  = make-io($moar-folder, "src/core/oplist");