Fill in URL for FamilyId support.

changes/happy-families

@@ -13,4 +13,5 @@
       thereby simplifying family operation,
       and making microdescriptor downloads approximately 80% smaller.
 
-      For more information, see (XXXX INSERT URL HERE).
+      For more information, see
+      https://community.torproject.org/relay/setup/post-install/family-ids/

doc/man/tor.1.txt

@@ -173,7 +173,8 @@ The following options in this section are only recognized on the
     To use this key, install it on every relay in your family.
     (Put it in the relay's `KeyDirectory`.)
     Then enable the corresponding FamilyID option on your relays.
-    See (XXXX INSERT URL HERE) for more information.
+    See https://community.torproject.org/relay/setup/post-install/family-ids/
+    for more information.
 
 **`--passphrase-fd`** __FILEDES__::
     File descriptor to read the passphrase from.  Note that unlike with the
@@ -2488,7 +2489,7 @@ is non-zero):
     this also generates the value you should use in the __ident__ field
     in a file ending with ".public\_family\_id".
     For information on generating and installing a family
-    key, see (XXXX INSERT URL HERE).
+    key, see https://community.torproject.org/relay/setup/post-install/family-ids/
       +
     In the future, this will be the preferred way for relays
     to advertise family membership.
@@ -4067,7 +4068,8 @@ __KeyDirectory__/**`secret_onion_key_ntor`** and **`secret_onion_key_ntor.old`**
 __KeyDirectory__/__keyname__**`.secret_family_key`**::
     A relay family's family identity key.
     Used to prove membership in a relay family.
-    See (XXXX INSERT URL HERE) for more information.
+    See https://community.torproject.org/relay/setup/post-install/family-ids/
+    for more information.
 
 __DataDirectory__/**`fingerprint`**::
     Only used by servers. Contains the fingerprint of the server's RSA

src/feature/relay/routerkeys.c

@@ -878,6 +878,9 @@ load_family_id_keys(const or_options_t *options,
   return 0;
 }
 
+#define FAMILY_INFO_URL \
+  "https://community.torproject.org/relay/setup/post-install/family-ids/"
+
 /** Generate warnings as appropriate about our family ID configuration.
  *
  * `options` is required; `ns` may be NULL.
@@ -907,7 +910,7 @@ warn_about_family_id_config(const or_options_t *options,
                  "MyFamily was configured, but FamilyId was not. "
                  "It's a good time to start migrating your relays "
                  "to use family keys. "
-                 "See (XXXX INSERT URL HERE) for instructions.");
+                 "See "FAMILY_INFO_URL " for instructions.");
       have_warned_absent_familykeys = 1;
     }
   }