Shorten docstring (for CLI compat) (#19356)

Author: mathematicalmichael

src/lightning/pytorch/callbacks/batch_size_finder.py

@@ -31,10 +31,11 @@
 
 
 class BatchSizeFinder(Callback):
-    """The ``BatchSizeFinder`` callback tries to find the largest batch size for a given model that does not give an
-    out of memory (OOM) error. All you need to do is add it as a callback inside Trainer and call
-    ``trainer.{fit,validate,test,predict}``. Internally it calls the respective step function ``steps_per_trial`` times
-    for each batch size until one of the batch sizes generates an OOM error.
+    """Finds the largest batch size supported by a given model before encountering an out of memory (OOM) error.
+
+    All you need to do is add it as a callback inside Trainer and call ``trainer.{fit,validate,test,predict}``.
+    Internally, it calls the respective step function ``steps_per_trial`` times for each batch size until one
+    of the batch sizes generates an OOM error.
 
     .. warning::  This is an :ref:`experimental <versioning:Experimental API>` feature.