Fix builing typo in example multi style

Fixes osm2pgsql-dev#264

Author: pnorman

multi.lua

@@ -42,7 +42,7 @@ function building_rels (kv, num_keys)
   return generic_rels(building_interesting, kv)
 end
 
-function builing_rel_members (kv, keyvaluemembers, roles, membercount)
+function building_rel_members (kv, keyvaluemembers, roles, membercount)
   return generic_rel_members(building_interesting, kv, keyvaluemembers, roles, membercount, building_transform)
 end
 
@@ -268,4 +268,4 @@ function generic_rel_members (f, keyvals, keyvaluemembers, roles, membercount, t
   end
   tags =  t(keyvals)
   return filter, tags, membersuperseeded, boundary, polygon, roads
-end
+end

multi.style.json

@@ -53,7 +53,7 @@
     "tagtransform-node-function": "drop_all",
     "tagtransform-way-function": "building_ways",
     "tagtransform-relation-function": "building_rels",
-    "tagtransform-relation-member-function": "builing_rel_members",
+    "tagtransform-relation-member-function": "building_rel_members",
     "tags": [
       {"name": "name", "type": "text"},
       {"name": "name_en", "type": "text"},