Corrected the line references for the basic controller example#6016

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UbiquitousBear wants to merge 1 commit intosymfony:2.8from UbiquitousBear:bugfix/controller-line-reference

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Commits on Dec 15, 2015

Corrected the line references for the basic controller example; added a reference to separate use statement from initial namespacing explanation.
UbiquitousBear
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