Reworded the built-in web server articles for Symfony 3.3#8273

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javiereguiluz wants to merge 3 commits intosymfony:3.3from

javiereguiluz:fix_8270

Commits on Aug 10, 2017

Reworded the built-in web server articles for Symfony 3.3
javiereguiluz
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Commits on Aug 13, 2017

Fixed RST syntax
javiereguiluz
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Commits on Sep 1, 2017

Simplification
javiereguiluz
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