Reword Berkeley DB requirement to be less specific.

Likely should do this across the board (e.g., rely more on README)

doc/guide/admin/install.sdf

@@ -121,10 +121,10 @@ in the base system or as an optional software component.  If not,
 you'll have to obtain and install it yourself.
 
 {{PRD:Berkeley DB}} is available from {{ORG[expand]Sleepycat}}'s
-download page {{URL: http://www.sleepycat.com/download/}}.
-There are several versions available.  At the time of this writing,
-the latest release, version 4.1, is recommended. This package is
-required if you wish to use the {{TERM:BDB}} database backend.
+download page {{URL: http://www.sleepycat.com/download/}}.  There
+are several versions available.  Generally, the most recent release
+(with published patches) is recommended.  This package is required
+if you wish to use the {{TERM:BDB}} database backend.
 
 OpenLDAP's {{slapd}}(8) LDBM backend supports a variety of data
 base managers including {{PRD:Berkeley DB}} and {{PRD:GDBM}}.