mention intuitive readings of max= and min=

pmichaud++ came up with those.

Author: timo

lib/operators.pod

@@ -965,10 +965,14 @@ Defined-or operator. Returns the first defined operand. Short-circuits.
 
 Returns the smallest of the arguments, as determined by L<cmp> semantics.
 
+    $foo min= 0  # read as: $foo decreases to 0
+
 =head2 infix max
 
 Returns the largest of the arguments, as determined by L<cmp> semantics.
 
+    $foo max= 0  # read as: $foo increases to 0
+
 =head1 Conditional Operator Precedence
 
 =head2 infix ?? !!