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[docs] Schedule testing section, put schedule examples under test

Description

[docs] Schedule testing section, put schedule examples under test

Summary: Add testing section for schedules, put schedule examples under test.

Test Plan:
test docs build

Screen Shot 2021-05-24 at 1.33.47 PM.png (633×1 px, 150 KB)

Reviewers: sandyryza, yuhan

Reviewed By: sandyryza

Subscribers: alangenfeld, dgibson

Differential Revision: https://dagster.phacility.com/D8054