mention 'switch' is experimental in feature.pm

The other experimental features already have nice warnings in feature.pm
Perl · Oct 18, 2014 · 7caca87 · 7caca87
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diff --git a/lib/feature.pm b/lib/feature.pm
@@ -135,6 +135,12 @@ This feature is available starting with Perl 5.10.
 
 =head2 The 'switch' feature
 
+B<WARNING>: Because the L<smartmatch operator|perlop/"Smartmatch Operator"> is
+experimental, Perl will warn when you use this feature, unless you have
+explicitly disabled the warning:
+
+    no warnings "experimental::smartmatch";
+
 C<use feature 'switch'> tells the compiler to enable the Perl 6
 given/when construct.
 

diff --git a/regen/feature.pl b/regen/feature.pl
@@ -450,6 +450,12 @@ =head2 The 'state' feature
 
 =head2 The 'switch' feature
 
+B<WARNING>: Because the L<smartmatch operator|perlop/"Smartmatch Operator"> is
+experimental, Perl will warn when you use this feature, unless you have
+explicitly disabled the warning:
+
+    no warnings "experimental::smartmatch";
+
 C<use feature 'switch'> tells the compiler to enable the Perl 6
 given/when construct.