Address some of the issues with xmldoc summaries #684
Currently there is a bug in FCS (Not yet logged) where XmlDocSigs are not present in the symbol information.
There are also issues (Not regressions) where generic tooltip xmldoc lookups are not working Dictionary<_,_>.ContainsKey doesnt work.
Merge pull request #690 from 7sharp9/tooltipissues

Address some of the issues with xmldoc summaries #684