Document ops.markdown cleanup; ambigious two/to

Fixes statements that could be interpreted multiple ways. i.e.: 

Return non-zero if $l is greater than or equal two $r. ('two' should be 'to' for equals-to, not 2 for 2*$r)
Return non-zero if $l is greater than two $r. ('two' left in from c&p?)
Merge pull request #201 from ugexe/patch-1

Document ops.markdown cleanup; ambigious two/to