DOC: Fixed examples in `pandas/core/window`#33266

Merged

WillAyd merged 4 commits intopandas-dev:masterfrom

ShaharNaveh:DOC-DocTests-core-window

Apr 4, 2020

Commits on Apr 3, 2020

DOC: Fixed examples in `pandas/core/window`
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Using simpler numbers in examples
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Merge remote-tracking branch 'upstream/master' into DOC-DocTests-core-window
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Restarting azure
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