Update trainer.py

Author: kilavvy

examples/fabric/build_your_own_trainer/trainer.py

@@ -35,7 +35,7 @@ def __init__(
         checkpoint_dir: str = "./checkpoints",
         checkpoint_frequency: int = 1,
     ) -> None:
-        """Exemplary Trainer with Fabric. This is a very simple trainer focused on readablity but with reduced
+        """Exemplary Trainer with Fabric. This is a very simple trainer focused on readability but with reduced
         featureset. As a trainer with more included features, we recommend using the
         :class:`lightning.pytorch.Trainer`.