Maybe the documentation is wrong...looking at the man page (version 2.4-Release), there're only two possible general options:
Specify general options.
nettimeout=<timeout> (in seconds, or "none" or "max")
ldif-wrap=<width> (in columns, or "no" for no wrapping)
That said, the man page has some related mentions, e.g.
Specify general extensions with -e and search extensions with
-E. '!' indicates criticality.
!authzid=<authzid> ("dn:<dn>" or "u:<user>")
Specify SASL security properties.
Specify the SASL mechanism to be used for authentication. If
it's not specified, the program will choose the best mechanism
the server knows.
so maybe one of these does the trick, just have a look at your
ldapsearch's man page.
There's a reference on common errors with Kerberos, GSSAPI and SASL Authentication using LDAP that might be helpful once the correct options are picked.