I am looking at LDAP module for Apache httpd for authentication. The 'yum install' gives me 'mod_authz_ldap.i386 0:0.26-9.el5_5.1', whereas on Apache documentation site I find mod_authNz_ldap module. Both
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modules appear to be different looking at available directives. Any clues or suggestions on which module should be used? Where can I find documentation for mod_authz_ldap?
Look inside your httpd.conf file, it will answer that one for you. RHEL's httpd supports ldap auth as shipped.
What I did in my httpd.conf file;
/snip
Your question was about modules, in your httpd.conf you find a list of _modules_ it loads... That should remove the ambiguity around which documentation to follow.
See the line: LoadModule authnz_ldap_module modules/mod_authnz_ldap.so