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add note on service parameters regarding ScopeWideningInjectionException

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`@@ -231,6 +231,15 @@ looks up the value of each parameter and uses it in the service definition.`
`231`	`231`
`232`	`232`	`<argumenttype="string">http://symfony.com/?foo=%%s&bar=%%d</argument>`
`233`	`233`
	`234`	`+..note::`
	`235`	`+`
	`236`	`+ It can be useful to pass other services in as arguments to your custom service.`
	`237`	+ For example, you may want to pass in the `request` service as an argument.
	`238`	+ In these cases, you may receive a `ScopeWideningInjectionException`.
	`239`	`+ To understand this problem better and learn how to solve it, refer to`
	`240`	+ the cookbook article:doc:`/cookbook/service_container/scopes` for a
	`241`	`+ few solutions.`
	`242`	`+`
`234`	`243`	`The purpose of parameters is to feed information into services. Of course`
`235`	`244`	`there was nothing wrong with defining the service without using any parameters.`
`236`	`245`	`Parameters, however, have several advantages:`

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