Documentation: Added the |(pipe)/OR operator to syntax/methods.

It was not documented as an operator that can be overriden, which is confusing because it makes you think it can't be.

Author: der-scheme

doc/syntax/methods.rdoc

@@ -100,6 +100,7 @@ operators.
 <code>/</code>   :: divide
 <code>%</code>   :: modulus division, String#%
 <code>&</code>   :: AND
+<code>|</code>   :: OR
 <code>^</code>   :: XOR (exclusive OR)
 <code>>></code>  :: right-shift
 <code><<</code>  :: left-shift, append