Remove repeated index entry; adds nothing different.

Closes SF bug #518985.

Doc/ref/ref3.tex

@@ -143,8 +143,7 @@ This type has a single value.  There is a single object with this value.
 This object is accessed through the built-in name \code{Ellipsis}.
 It is used to indicate the presence of the \samp{...} syntax in a
 slice.  Its truth value is true.
-\ttindex{Ellipsis}
-\obindex{Ellipsis@{\texttt{Ellipsis}}}
+\obindex{Ellipsis}
 
 \item[Numbers]
 These are created by numeric literals and returned as results by