In signatures.rakudoc: New material on type captures; work on introduction and parameter separators; some fixes here and there

doc/Language/perl-op.rakudoc

@@ -52,7 +52,7 @@ also used for method calls.  So Perl's C«$arrayref->[7]» becomes
 Raku's C<$arrayref.[7]> and C«$user->name» becomes C<$user.name>.
 Note that dereferencing is rare in Raku.
 
-Raku uses the C<->> to attach L<C<Signature>|/type/Signature>s to
+Raku uses the C«->» to attach L<C<Signature>|/type/Signature>s to
 L<C<Block>|/type/Block>s.
 
 =head2 Auto-increment and auto-decrement

doc/Language/pod.rakudoc

@@ -550,9 +550,16 @@ C<my $var = 1; say $var;>
 
 C<my $var = 1; say $var;>
 
+If the enclosed code itself contains an unmatched C«>»,
+enclose it in C<C« »>
+=for code :lang<rakudoc>
+C«sub f(Int --> Int) {}»
+
+C«sub f(Int --> Int) {}»
+
 =head2 Links
 
-To create a link enclose it in C<L< >>:
+To create a link enclose it in C<L< >>
 
 =for code :lang<rakudoc>
 Raku homepage L<https://raku.org>