Update Gunzip interface docstring

Co-authored-by: Chris Markiewicz <[email protected]>

Author: ghisvail

nipype/algorithms/misc.py

@@ -337,7 +337,7 @@ class GunzipInputSpec(GzipInputSpec):
 
 
 class Gunzip(Gzip):
-    """Gzip wrapper defaulting to decompression
+    """Gunzip wrapper
 
     >>> from nipype.algorithms.misc import Gunzip
     >>> gunzip = Gunzip(in_file='tpms_msk.nii.gz')