HPCC-11923 DOCS: Updates to LDAP section

Fix HPCC-11923 DOCS: Updates to LDAP section
Updates to LDAP section provided by SME.

Signed-off-by: g-pan <greg.panagiotatos@lexisnexis.com>
removed unneeded images

Signed-off-by: g-pan <greg.panagiotatos@lexisnexis.com>
Merge pull request #6311 from g-pan/H11923-UpdLDAP

HPCC-11923 DOCS: Updates to LDAP section

Reviewed-By: Jim DeFabia <james.defabia@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>