Docstring fixes

Author: ehrenfeu

src/imcflibs/iotools.py

@@ -22,6 +22,7 @@ def filehandle(fname, mode="r"):
     Parameters
     ----------
     fname : str or filehandle
+        The object to ensure it is a file handle, or to create one from it.
     mode : str
         The desired mode of the filehandle (default=read).