Update table of I/O supported types

[vuule]

Support for a few types has been added without updating the table in the documentation. Updating the table here to match the current support.

[codecov]

Codecov Report

Merging #9476 (ac46384) into branch-21.12 (ab4bfaa) will decrease coverage by 0.13%.
The diff coverage is n/a.

❗ Current head ac46384 differs from pull request most recent head 106aec6. Consider uploading reports for the commit 106aec6 to get more accurate results

@@               Coverage Diff                @@
##           branch-21.12    #9476      +/-   ##
================================================
- Coverage         10.79%   10.65%   -0.14%     
================================================
  Files               116      117       +1     
  Lines             18869    19760     +891     
================================================
+ Hits               2036     2106      +70     
- Misses            16833    17654     +821     

Impacted Files	Coverage Δ
python/cudf/cudf/io/csv.py	0.00% <0.00%> (ø)
python/cudf/cudf/io/hdf.py	0.00% <0.00%> (ø)
python/cudf/cudf/io/orc.py	0.00% <0.00%> (ø)
python/cudf/cudf/__init__.py	0.00% <0.00%> (ø)
python/cudf/cudf/_version.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/abc.py	0.00% <0.00%> (ø)
python/cudf/cudf/api/types.py	0.00% <0.00%> (ø)
python/cudf/cudf/io/dlpack.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/frame.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/index.py	0.00% <0.00%> (ø)
... and 61 more

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[vuule]

Well, this became single character PR :D

[galipremsagar]

@gpucibot merge