Suggests nextsame/nextwidth

Which would close #1389. Also eliminates accidental MD, references
issue #2022. Some minor reformatting.

doc/Language/5to6-nutshell.pod6

@@ -261,7 +261,7 @@ first $coderef, @values, :k;
 
 =begin item
 C<&foo;> I<and> C<goto &foo;> I<for re-using the caller's argument list /
-replacing the caller in the call stack>. Perl 6 can use L<C<callsame>|/language/functions#index-entry-dispatch_callsame> for re-dispatching
+replacing the caller in the call stack>. Perl 6 can use either L<C<callsame>|/language/functions#index-entry-dispatch_callsame> for re-dispatching or L<C<nextsame>|/language/functions#index-entry-dispatch_nextsame> and L<C<nextwitch>|/language/functions#index-entry-dispatch_nextwith>, which have no exact equivalent in Perl 5.
 
 =begin comment
     # TODO: Suggest .nextsame and .nextwith once they've been implemented in Rakudo.
@@ -275,9 +275,16 @@ sub foo { say "before"; bar(|@_); say "after" } # Perl 6 - have to be explicit
 
 =for code :lang<perl5>
 sub foo { say "before"; goto &bar } # Perl 5
-=for code
-proto foo (|) {*};  multi foo ( Any $n ) {  say "Any"; say $n; }; multi foo ( Int $n ) { say "Int"; callsame; }; foo(3); # /language/functions#index-entry-dispatch_callsame
-
+=begin code
+proto foo (|) {*};
+multi foo ( Any $n ) {
+    say "Any"; say $n;
+};
+multi foo ( Int $n ) {
+    say "Int"; callsame;
+};
+foo(3); # /language/functions#index-entry-dispatch_callsame
+=end code
 
 =end item
 
@@ -1716,11 +1723,11 @@ Larry Wall's own code for translating Perl 5 to Perl 6 has bit-rotted, and
 is not (currently) viable on recent releases of Perl 5.
 
 MAD (Misc Attribute Definition) is a configuration option when building
-Perl from a source distribution. The `perl` executable analyses and
+Perl from a source distribution. The C<perl> executable analyses and
 translates your Perl sourcecode into an op-tree, and then executes the
 program by walking the op-tree. Normally, most of the details from the
 analysis are thrown away during this process. When MAD is enabled, the
-`perl` executable will save those details to an XML file, which can then be
+C<perl> executable will save those details to an XML file, which can then be
 read and further processed into Perl 6 code by a MAD parser.
 
 Please consult #perl6 to find out the best release of Perl 5 to use for