PATCH: [perl #131142] Revise 'if' documentation

This adds text about how to import when you want to 'use MODULE ()'

dist/if/if.pm

@@ -1,6 +1,6 @@
 package if;
 
-$VERSION = '0.0606';
+$VERSION = '0.0607';
 
 sub work {
   my $method = shift() ? 'import' : 'unimport';
@@ -50,6 +50,15 @@ The use of C<< => >> above provides necessary quoting of C<MODULE>.
 If you don't use the fat comma (eg you don't have any ARGUMENTS),
 then you'll need to quote the MODULE.
 
+If you wanted ARGUMENTS to be an empty list, i.e. have the effect of:
+
+    use MODULE ();
+
+you can't do this with the C<if> pragma; however, you can achieve
+exactly this effect, at compile time, with:
+
+    BEGIN { require MODULE if CONDITION }
+
 =head2 EXAMPLES
 
 The following line is taken from the testsuite for L<File::Map>: