Fix rbs

Author: Matt Muller

gems/smithy-client/sig/smithy-client/endpoint_rules.rbs

@@ -2,8 +2,8 @@ module Smithy
   module Client
     module EndpointRules
       class Endpoint
-        def initialize: (uri: String, ?properties: ::Hash[String, untyped], ?headers: ::Hash[String, String|Array[String]]) -> void
-        attr_accessor uri: String
+        def initialize: (url: String, ?properties: ::Hash[String, untyped], ?headers: ::Hash[String, String|Array[String]]) -> void
+        attr_accessor url: String
         attr_accessor properties: Hash[String, untyped]
         attr_accessor headers: Hash[String, String|Array[String]]
       end