Reworded the "How to use Gmail" cookbook article#5856

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javiereguiluz wants to merge 5 commits intosymfony:2.3from

javiereguiluz:tweak_gmail_cookbook

Commits on Nov 3, 2015

Commits on Dec 14, 2015

Implemented all the recommended changes
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Commits on Dec 17, 2015

Fixed YAML syntax issue
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Commits on Dec 18, 2015

Last round of reviews
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