Clarify that exclude/include options in rsyncd.conf apply only to files

sent from the server or deleted on the server.

rsyncd.conf.yo

@@ -176,8 +176,11 @@ dit(bf(exclude)) The "exclude" option allows you to specify a space
 separated list of patterns to add to the exclude list. This is equivalent
 to the client specifying these patterns with the --exclude option, except
 that the exclude list is not passed to the client and thus only applies on
-the server and also only applies when receiving files from a server and not
-when sending files to it.  Only one "exclude" option may be specified, but
+the server: that is, it excludes files received by a client when receiving
+from a server and files deleted on a server when sending to a server, but
+it doesn't exclude files sent from a client when sending to a server or
+files deleted on a client when receiving from a server.  
+Only one "exclude" option may be specified, but
 you can use "-" and "+" before patterns to specify exclude/include.
 
 Note that this option is not designed with strong security in
@@ -189,24 +192,22 @@ file permissions.
 dit(bf(exclude from)) The "exclude from" option specifies a filename
 on the server that contains exclude patterns, one per line. This is
 equivalent to the client specifying the --exclude-from option with a
-equivalent file except that the resulting exclude patterns are not
-passed to the client and thus only apply on the server. See also the
-note about security for the exclude option above.
+equivalent file except that it applies only on the server.  See also
+the "exclude" option above.
 
 dit(bf(include)) The "include" option allows you to specify a space
 separated list of patterns which rsync should not exclude. This is
 equivalent to the client specifying these patterns with the --include
-option.  This is useful as it allows you to build up quite complex
-exclude/include rules.  Only one "include" option may be specified, but you
-can use "+" and "-" before patterns to switch include/exclude.
-
-See the section of exclude patterns in the rsync man page for information
-on the syntax of this option.
+option except that it applies only on the server.  This is useful as it
+allows you to build up quite complex exclude/include rules.  Only one
+"include" option may be specified, but you can use "+" and "-" before
+patterns to switch include/exclude.  See also the "exclude" option above.
 
 dit(bf(include from)) The "include from" option specifies a filename
 on the server that contains include patterns, one per line. This is
 equivalent to the client specifying the --include-from option with a
-equivalent file.
+equivalent file except that it applies only on the server.  See also
+the "exclude" option above.
 
 dit(bf(auth users)) The "auth users" option specifies a comma and
 space separated list of usernames that will be allowed to connect to