(ITS#8956) Update slapd-sql(5) man page to remove BDB reference

[quanah@openldap.org]

Full_Name: Quanah Gibson-Mount
Version: 2.4.47
OS: N/A
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (47.208.148.239)


The slapd-sql(5) man page has the following blurb:

       It is NOT designed as a general-purpose backend that uses RDBMS instead
       of BerkeleyDB (as the standard BDB backend does), though it can be used
       as  such  with  several  limitations.


Given the deprecation of BDB based backends, this should be updated to reference
LMDB and back-mdb.