Add NumPy to intersphinx references.

[bdice]

This PR adds numpy to the list of intersphinx references, which is needed to cross-reference numpy functions in cuDF's documentation. The Python intersphinx reference was updated to resolve a warning caused by a redirect. This also fixes a reference to numpy.asarray, which is a function (not a method).

[codecov]

Codecov Report

Merging #10809 (7b12fc7) into branch-22.06 (8d861ce) will increase coverage by 0.04%.
The diff coverage is 96.49%.

@@               Coverage Diff                @@
##           branch-22.06   #10809      +/-   ##
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+ Coverage         86.40%   86.44%   +0.04%     
================================================
  Files               143      143              
  Lines             22448    22493      +45     
================================================
+ Hits              19396    19445      +49     
+ Misses             3052     3048       -4     

Impacted Files	Coverage Δ
python/cudf/cudf/core/frame.py	93.41% <ø> (ø)
python/cudf/cudf/core/indexed_frame.py	91.70% <ø> (ø)
python/cudf/cudf/core/dataframe.py	93.77% <96.29%> (+0.08%)	⬆️
python/cudf/cudf/testing/_utils.py	94.05% <100.00%> (+0.06%)	⬆️
python/cudf/cudf/core/column/string.py	89.21% <0.00%> (+0.12%)	⬆️
python/cudf/cudf/core/groupby/groupby.py	91.79% <0.00%> (+0.22%)	⬆️
python/cudf/cudf/core/tools/datetimes.py	84.49% <0.00%> (+0.30%)	⬆️
python/cudf/cudf/core/column/lists.py	92.91% <0.00%> (+0.83%)	⬆️

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[galipremsagar]

@gpucibot merge