[Ldap] Updated Ldap component documentation for 3.1#6982

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csarrazi wants to merge 2 commits intosymfony:3.1from

csarrazi:feat/ldap-3.1

Commits on Sep 19, 2016

Updated LDAP documentation for Symfony 3.1
csarrazi
committed

Commits on Jan 9, 2018

Minor fixes
javiereguiluz
authored