Removed outdated translations from the official list
Fix documentation for group_sequence_provider
document multiple recipients in XML configs

Adds an example on how to configure multiple recipients in Monolog
for sending log entries as e-mails.
tweaks for the web server configuration chapter
Fixed minor typos.
Removing extra whitespace
Added the schema_filter option to the reference
Added custom format page to translation component
Link from introduction section
Small fixes
Cleanups
Fixed version for composer install
Improvements based on comments
Extra improvements based on comments
Fixed wrong indentation
Updated for CMF doc refactoring
Adding 'attr' option to the Textarea options list

`attr` is a quite useful option, but not yet listed here. BTW, the `attr.rst.inc` file already includes an `attr` conf. example concerning textareas.
[Reference] consistent & complete config examples
Update voters.rst

Corrected the service name to be injected0
fixes environment/application mistake