Documented the use of binary values as container params#9780

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javiereguiluz wants to merge 2 commits intosymfony:4.1from

javiereguiluz:fix_9650

Commits on May 16, 2018

Documented the use of binary values as container params
javiereguiluz
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Commits on May 20, 2018

Fixed a grammar typo
javiereguiluz
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