Update fields in source-connectors specifications: mysql, onesignal, oracle, outreach, paystack, pipedrive, pokeapi (#8582)

Signed-off-by: Sergey Chvalyuk <grubberr@gmail.com>

Co-authored-by: Sergey Chvalyuk <grubberr@gmail.com>
Co-authored-by: Sherif A. Nada <snadalive@gmail.com>