documentation error


In the Sage User Guide Mosaic document, there is a small error in the 
SgExpression explanation.  To use the not equal operator, it specifies
passing the NEQ_OP macro.  This didn't compile, so I looked up the 
macro in sage/h/tag.doc, where it specifies NOTEQL_OP.  This compiled.
A small problem, but I thought I'd let you know.