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Update rest-versioning.md

Add module controller namespace in config

fixes #5218

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related to #5083

[skip ci] Expand abnormally used ternary operator to if

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grammar fix [ci skip]

[ci skip] Update rest-response-formatting.md

[skip ci] Update rest-routing.md

fix typo

Added a note that pluralization of controller IDs in RESTful endpoints by yii\rest\UrlRule doesn't always simply add "s" to the end of the controller ID.  I cited an example of controllers whose IDs end in the letter "x", for example "BoxController", whose RESTful endpoints are pluralized to "boxes"

close #5261

fixes #5260

[ci skip] Update start-databases.md