man: Fix documentation of pubkey constraints

Hash algorithms have to be repeated for multiple key types.

References #2514.

man/ipsec.conf.5.in

@@ -609,9 +609,10 @@ To limit the acceptable set of hashing algorithms for trustchain validation,
 append hash algorithms to
 .BR pubkey
 or a key strength definition (for example
-.BR pubkey-sha1-sha256
+.BR pubkey-sha256-sha512 ,
+.BR rsa-2048-sha256-sha384-sha512 ,
 or
-.BR rsa-2048-ecdsa-256-sha256-sha384-sha512 ).
+.BR rsa-2048-sha256-ecdsa-256-sha256-sha384 ).
 Unless disabled in
 .BR strongswan.conf (5),
 or explicit IKEv2 signature constraints are configured (see below), such key