man: ip-address: document mngtmpaddr and noprefixroute flags

Signed-off-by: Phil Sutter <phil@nwl.cc>

man/man8/ip-address.8.in

@@ -67,7 +67,7 @@ temporary " | " CONFFLAG-LIST " ]"
 
 .ti -8
 .IR CONFFLAG " := "
-.RB "[ " home " | " nodad " ]"
+.RB "[ " home " | " mngtmpaddr " | " nodad " | " noprefixroute " ]"
 
 .ti -8
 .IR LIFETIME " := [ "
@@ -180,11 +180,27 @@ outgoing connections. Defaults to
 (IPv6 only) designates this address the "home address" as defined in
 RFC 6275.
 
+.TP
+.B mngtmpaddr
+(IPv6 only) make the kernel manage temporary addresses created from this one as
+template on behalf of Privacy Extensions (RFC3041). For this to become active,
+the \fBuse_tempaddr\fP sysctl setting has to be set to a value greater than
+zero.  The given address needs to have a prefix length of 64. This flag allows
+to use privacy extensions in a manually configured network, just like if
+stateless auto-configuration was active.
+
 .TP
 .B nodad
 (IPv6 only) do not perform Duplicate Address Detection (RFC 4862) when
 adding this address.
 
+.TP
+.B noprefixroute
+Do not automatically create a route for the network prefix of the added
+address, and don't search for one to delete when removing the address. Changing
+an address to add this flag will remove the automatically added prefix route,
+changing it to remove this flag will create the prefix route automatically.
+
 .SS ip address delete - delete protocol address
 .B Arguments:
 coincide with the arguments of