Updated documentation for addr_uri argument in AddListeningPort: …

…Removed extraneous bracket and random (?) slash. (grpc#26263)

include/grpcpp/server_builder.h

@@ -121,8 +121,8 @@ class ServerBuilder {
   /// \param addr_uri The address to try to bind to the server in URI form. If
   /// the scheme name is omitted, "dns:///" is assumed. To bind to any address,
   /// please use IPv6 any, i.e., [::]:<port>, which also accepts IPv4
-  /// connections.  Valid values include dns:///localhost:1234, /
-  /// 192.168.1.1:31416, dns:///[::1]:27182, etc.).
+  /// connections.  Valid values include dns:///localhost:1234,
+  /// 192.168.1.1:31416, dns:///[::1]:27182, etc.
   /// \param creds The credentials associated with the server.
   /// \param[out] selected_port If not `nullptr`, gets populated with the port
   /// number bound to the \a grpc::Server for the corresponding endpoint after