index_copy operator docs errors

[aaronmarkham]

Description

Sphinx throws an error generating the docs for the index_copy op.

Error

/home/ubuntu/incubator-mxnet/python/mxnet/ndarray/contrib.py:docstring of mxnet.ndarray.contrib.index_copy:1: WARNING: Inline interpreted text or phrase reference start-string without end-string.
/home/ubuntu/incubator-mxnet/python/mxnet/ndarray/contrib.py:docstring of mxnet.ndarray.contrib.index_copy:13: WARNING: Literal block expected; none found.
/home/ubuntu/incubator-mxnet/python/mxnet/ndarray/contrib.py:docstring of mxnet.ndarray.contrib.index_copy:24: WARNING: Definition list ends without a blank line; unexpected unindent.

[frankfliu]

@mxnet-label-bot [Doc]