Further coding standards fixes.
removed duplicate arguments from base formattter
Edited the existing instructions

Didn’t touch the end yet, with the TBD et al.
Merge pull request #2535 from maximal/patch-1

Further coding standards fixes.
Closing and opening braces in Yii2 coding standards.
fixed Migration::execute() to use params correctly
Merge pull request #2536 from maximal/codestandards

Closing and opening braces in Yii2 coding standards.