Update is_floating_point() docs to mention bfloat16

[TylerADavis]

Fixes #49610 . Explicitly mentions that is_floating_point() will return True if passed a bfloat16 tensor.

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💊 CI failures summary and remediations

As of commit d1502fa (more details on the Dr. CI page):

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• 1/1 failures possibly* introduced in this PR
  • 1/1 non-CircleCI failure(s)

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This comment has been revised 4 times.

[TylerADavis]

I've now completed the CLA

[codecov]

Codecov Report

Merging #49611 (d1502fa) into master (4a870f6) will increase coverage by 0.19%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #49611      +/-   ##
==========================================
+ Coverage   80.43%   80.62%   +0.19%     
==========================================
  Files        1880     1880              
  Lines      204078   204078              
==========================================
+ Hits       164140   164534     +394     
+ Misses      39938    39544     -394     

[facebook-github-bot]

@VitalyFedyunin has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[facebook-github-bot]

@VitalyFedyunin merged this pull request in b414123.