fixed StringExpressionLanguageProvider code example #4636#4637

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danieleorler wants to merge 2 commits intosymfony:2.6from

danieleorler:improve_expressionlanguage_chapter

Commits on Dec 12, 2014

fixed StringExpressionLanguageProvider code example

danieleorler
authored and
danorler
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fix indentation and missing comma after array element

danieleorler
authored and
danorler
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