Update broken links to:

- introduction to keras for engineers
- introduction to keras for researchers

PiperOrigin-RevId: 380842991

README.md

@@ -143,9 +143,9 @@ for inputs, targets in dataset:
 
 For more in-depth tutorials about Keras, you can check out:
 
-- [Introduction to Keras for engineers](/getting_started/intro_to_keras_for_engineers/)
-- [Introduction to Keras for researchers](/getting_started/intro_to_keras_for_researchers/)
-- [Developer guides](/guides/)
+- [Introduction to Keras for engineers](https://keras.io/getting_started/intro_to_keras_for_engineers/)
+- [Introduction to Keras for researchers](https://keras.io/getting_started/intro_to_keras_for_researchers/)
+- [Developer guides](https://keras.io/guides/)
 
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