Fix broken link (#1179)

Author: jbischof

templates/api/keras_nlp/index.md

@@ -4,6 +4,6 @@ KerasNLP is a toolbox of modular building blocks ranging from pretrained
 state-of-the-art models, to low-level Transformer Encoder layers. For an
 introduction to the library see the  [KerasNLP home page](/keras_nlp). For a
 high-level introduction to the API see our
-[getting started guide](guides/keras_nlp/getting_started/).
+[getting started guide](/guides/keras_nlp/getting_started/).
 
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