Update docker-compose.yml email module/config

[hnsr]

fruitcake/magento2-email-advanced-config has proven to be less hassle than the other options for using Mailhog for local e-mail testing

-  # composer require fruitcake/magento2-email-advanced-config
-  # php bin/magento module:enable Fruitcake_EmailAdvancedConfig
+  # composer require magepal/magento2-gmailsmtpapp
   # php bin/magento setup:upgrade
   # bin/magento config:set --lock-env system/smtp/disable 0
-  # bin/magento config:set --lock-env fruitcake_email_advanced/smtp/transport smtp
-  # bin/magento config:set --lock-env fruitcake_email_advanced/smtp/auth none
-  # bin/magento config:set --lock-env fruitcake_email_advanced/smtp/ssl none
-  # bin/magento config:set --lock-env fruitcake_email_advanced/smtp/host localhost
-  # bin/magento config:set --lock-env fruitcake_email_advanced/smtp/port 1025
+  # bin/magento config:set --lock-env system/gmailsmtpapp/active 1
+  # bin/magento config:set --lock-env system/gmailsmtpapp/auth NONE
+  # bin/magento config:set --lock-env system/gmailsmtpapp/ssl none
+  # bin/magento config:set --lock-env system/gmailsmtpapp/smtphost localhost
+  # bin/magento config:set --lock-env system/gmailsmtpapp/smtpport 1025

[hnsr]

Fixed in #135