docs: lowercase 8 project names to match their import names

eyeD3→eyed3, Gooey→gooey, gTTS→gtts, MechanicalSoup→mechanicalsoup,
MonkeyType→monkeytype, PraisonAI→praisonai, PyMySQL→pymysql,
Zappa→zappa.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>