doc: Update LDAP configuration doc
doc: Update LDAP configuration doc

Add some examples to explain clearer how to configure LDAP in LibrePlan.

LibrePlan/libreplan,PaulLuchyn/libreplan,skylow95/libreplan,skylow95/libreplan,LibrePlan/libreplan,Marine-22/libre,dgray16/libreplan,skylow95/libreplan,poum/libreplan,LibrePlan/libreplan,poum/libreplan,dgray16/libreplan,Marine-22/libre,dgray16/libreplan,dgray16/libreplan,dgray16/libreplan,PaulLuchyn/libreplan,skylow95/libreplan,PaulLuchyn/libreplan,skylow95/libreplan,skylow95/libreplan,poum/libreplan,LibrePlan/libreplan,PaulLuchyn/libreplan,poum/libreplan,poum/libreplan,PaulLuchyn/libreplan,Marine-22/libre,PaulLuchyn/libreplan,Marine-22/libre,LibrePlan/libreplan,poum/libreplan,PaulLuchyn/libreplan,dgray16/libreplan,Marine-22/libre,LibrePlan/libreplan,dgray16/libreplan,LibrePlan/libreplan,Marine-22/libre