Merge pull request #4 from sharocko/where_can_i_find_a_reference_for_a_gramming_language

update wording and add links to APIs
Update where-can-i-find-a-reference-for-a-programming-languages-syntax.md

fixed typo
Update where-can-i-find-a-reference-for-a-programming-languages-syntax.md

clarified glossary and API links; added PHP API link
suggested formatting change and add a link to API on wiki