only the phpManager configuration was described, the DbManager configuration was not found on this documentation

close #6771

formatting date and time values for years >=2038 or <=1901 is now possible also with intl extension is
installed. 32bit systems will fall back to the PHP implementation because intl uses a 32bit UNIX timestamp internally.
On a 64bit system the intl formatter is used in all cases if installed.

fixes #5577

fixes #6760

typos

fixes #6682

Upgrade of images related to GII, directories guide-xx/images due to commit
Fixes #6367: Added `yii\gii\generators\crud\Generator` to support cus…
(https://github.com/yiisoft/yii2/commit/d7c3e7815b9b00ce47f0c49df38e4c040511ee6b)
where the field was removed moduleid

miss blank

close #6578