Fix typo in combined_loader.py documentation (#17256)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: OmerShubi

src/lightning/pytorch/utilities/combined_loader.py

@@ -187,7 +187,7 @@ class CombinedLoader(Iterable):
               through the rest of the iterables.
             * ``max_size``: stops after the longest iterable (the one with most items) is done, while returning None
               for the exhausted iterables.
-            * ``sequential``: completely consumes ecah iterable sequentially, and returns a triplet
+            * ``sequential``: completely consumes each iterable sequentially, and returns a triplet
               ``(data, idx, iterable_idx)``
 
     Examples: