update wording and add links to APIs

I changed the wording of this article quite a bit. I think you should use the term API because that's the actual term for a language reference. I added links to all the glossaries you had linked. Maybe we should just write PHP without a link and add a API but that would require further restructuring of the first bit. I also said to report issues with the glossary to the bugs group. I think issues could easily get lost if we tell them to do language specific groups especially since there are several language specific groups.