typo in documentation
line 1255:    This layer can add rows and columns of (not 'or') zeros
@@ -1252,7 +1252,7 @@ class ZeroPadding1D(Layer):
class ZeroPadding2D(Layer):
"""Zero-padding layer for 2D input (e.g. picture).
- This layer can add rows and columns or zeros
+ This layer can add rows and columns of zeros
at the top, bottom, left and right side of an image tensor.
# Arguments
