docs: add disruption budgets by reason documentation

[njtran]

Fixes #N/A

Description Adds documentation for disruption budget by reason

How was this change tested? make website

Does this change impact docs?

• [x] Yes, PR includes docs updates
• [ ] Yes, issue opened: #
• [ ] No

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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[coveralls]

Pull Request Test Coverage Report for Build 9686702262

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.03%) to 82.496%

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Totals
Change from base Build 9685128858:	0.03%
Covered Lines:	5552
Relevant Lines:	6730

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💛 - Coveralls