small update

nifty/field.py

@@ -36,12 +36,11 @@ from nifty.random import Random
 
 
 class Field(Loggable, Versionable, object):
-    """ Combines D2O-objects with meta-information NIFTY needs for computations.
+    """ The discrete representation of a continuous field over multiple spaces.
 
-    In NIFTY, Fields are used to store dataarrays and carry all the needed
+    In NIFTY, Fields are used to store data arrays and carry all the needed
     metainformation (i.e. the domain) for operators to be able to work on them.
-    In addition Field has functions to analyse the power spectrum of it's
-    content or create a random field of it.
+    In addition Field has methods to work with power-spectra.
 
     Parameters
     ----------