document the use of %modifiedLdapAttrs%

hello,

we need to document the use of %modifiedLdapAttrs%

Cheers

changed due date to April 23, 2020

changed milestone to %FusionDirectory 1.4

added PJ1802-0191 label

removed due date

added fusiondirectory-core label

added PJ1801-0146 label and removed PJ1802-0191 label

added telecom sud paris label

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added 3h of time spent at 2020-08-25