Update distribution references in documentation

Correct "Galactic" references to read "Foxy" where appropriate.

Signed-off-by: Abrar Rahman Protyasha <[email protected]>

Author: aprotyas

README.md

@@ -7,7 +7,7 @@ See the [design document](doc/design.md) for more details about how the bridge w
 
 ## Prerequisites
 
-- [ROS 2](https://index.ros.org/doc/ros2/Installation) (Galactic or newer)
+- [ROS 2](https://index.ros.org/doc/ros2/Installation) (Foxy or newer)
 
 ## Installation
 

src/domain_bridge/generic_subscription.hpp

@@ -71,8 +71,8 @@ class GenericSubscription : public rclcpp::SubscriptionBase
 
   // Post-Galactic, handle_serialized_message is a pure virtual function in
   // rclcpp::SubscriptionBase, so we must override it.  However, in order to
-  // make this change compatible with both Galactic and later, we leave off
-  // the 'override' flag.
+  // make this change compatible with all of Foxy, Galactic, and later, we
+  // leave off the 'override' flag.
   void
   handle_serialized_message(
     const std::shared_ptr<rclcpp::SerializedMessage> & serialized_message,