Fixed typo: 'LDA' -> 'LDAP'
LRDOCS-934 Clarified the 5 required LDAP user mapping fields*
Added note to map the LDAP user mapping group field so that membership info. is preserved when importing LDAP groups to Liferay user groups; added sample values for the LDAP user mapping fields
Clarified LDAP section on importing users and groups
Added missing parentheses
Merge pull request #835 from jrao/LRDOCS-934

https://issues.liferay.com/browse/LRDOCS-934