[DOCS] Add client interfaces for Node.js and Go / Rename JDBC language to Java

The first patch adds links to the node-postgres (Node.js) and the pq (Go) drivers to the externally maintained client interface list. The second patch updates the JDBC entry to change the "Language" field to Java. It currently says JDBC which is an interface specification, not a language. Regards

[DOCS] Fix some typos

Hello, Please consider committing the attached patches for docs. (One of them is affecting a comment in src/.) Also I found some inconsistent spellings of the names, but I'm not sure whether it should be fixed: 1. "Hans-Jurgen Schonig" and "Hans-Juergen Schoenig". Maybe it's better to spell