mention the CChoiceFormat param name in Yii::t doc
mention the CChoiceFormat param name in Yii::t doc

added doc line to $params parameter of Yii::t that mentions the name of
the CChoiceFormat parameter in translation message strings. {n}

kurorido1990/dev-github,wbfree/yii-tutorial,dbalencar/yii,intersvyaz/yii,lubosdz/yii,Corfiot/yii,Infowatch/yii,makasim/PayumYiiExtensionSandbox,licailing/yii,makasim/PayumYiiExtensionSandbox,lsjing/yii,GerrGIT/yii,lsjing/yii,ImAnilChaudhari/yii,scriptius/blog,lubosdz/yii,ImAnilChaudhari/yii,longhua828/yii,GerrGIT/yii,intersvyaz/yii,sachintaware/yii,YaDelivery/yii,YaDelivery/yii,YaDelivery/yii,tvs-prarthana/yii,auburus/yii,mqiu/yiis,GerrGIT/yii,longhua828/yii,Corfiot/yii,tvs-prarthana/yii,kurorido1990/dev-github,trewor-kapusta/yii,marcovtwout/yii,Yanan1021/yii,jackey/YiiAPI-Framework,Yanan1021/yii,tvs-prarthana/yii,sachintaware/yii,jackey/YiiAPI-Framework,intersvyaz/yii,marcovtwout/yii,bethrezen/yii,lsjing/yii,mudrezzz/testphp,janisto/yii,auburus/yii,GerrGIT/yii,auburus/yii,Vartacom/yii,ranvis/yii,scriptius/blog,phoenix3008/yii,marcovtwout/yii,ranvis/yii,ranvis/yii,longhua828/yii,er361/yii-zadanie-somnium,makasim/PayumYiiExtensionSandbox,phoenix3008/yii,bethrezen/yii,licailing/yii,l3xthanzero/trackstar,sachintaware/yii,bethrezen/yii,janisto/yii,kurorido1990/dev-github,mqiu/yiis,Vartacom/yii,guber007/yii,sachintaware/yii,ImAnilChaudhari/yii,l3xthanzero/trackstar,YaDelivery/yii,trewor-kapusta/yii,softark/yii,phoenix3008/yii,ImAnilChaudhari/yii,yiisoft/yii,janisto/yii,yiichina/yii,guber007/yii,janisto/yii,er361/yii-zadanie-somnium,tvs-prarthana/yii,er361/yii-zadanie-somnium,Vartacom/yii,guber007/yii,dbalencar/yii,mudrezzz/testphp,auburus/yii,l3xthanzero/trackstar,softark/yii,wbfree/yii-tutorial,marcovtwout/yii,mqiu/yiis,mudrezzz/testphp,makasim/PayumYiiExtensionSandbox,Infowatch/yii,mudrezzz/testphp,scriptius/blog,dbalencar/yii,kurorido1990/dev-github,licailing/yii,phoenix3008/yii,longhua828/yii,yiisoft/yii,yiichina/yii,licailing/yii,scriptius/blog,er361/yii-zadanie-somnium,lubosdz/yii,yiichina/yii,Yanan1021/yii,lsjing/yii,guber007/yii,Vartacom/yii,lubosdz/yii