Revert "re-introduce a comment about the mysql script using STDIN to the plugin_scripts.md readme"
Revert "re-introduce a comment about the mysql script using STDIN to the plugin_scripts.md readme"

This reverts commit e1b2e4e8505cad51f72128aed043a26bc4583c92.

Instrumental/instrumentald,Instrumental/instrumentald,Instrumental/instrumentald