docstring sytax error fixed

Author: AbishekRajVG

tiatoolbox/models/engine/engine_abc.py

@@ -584,7 +584,7 @@ def run(
             >>>     overwrite=True
             >>>     )
             >>> output
-            ... /tmp/patch_output/output.zarr
+            ... '/tmp/patch_output/output.zarr'
         """
         for key in kwargs:
             setattr(self, key, kwargs[key])