Expansion Panel hideToggle typo in docs

[mackelito]

Bug, feature request, or proposal:

bug

What is the expected behavior?

the docs should say hideToggle

What is the current behavior?

toogleHide

What are the steps to reproduce?

https://github.com/angular/material2/blob/385272e5d3fb820a3cac52de6a5b1b852f0ef703/src/lib/expansion/expansion.md

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What is the use-case or motivation for changing an existing behavior?

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Is there anything else we should know?

[willshowell]

I think you're looking at @julianobrasil's unmerged PR #5823 as that file does not exist on master

[julianobrasil]

😄 I'm going to fix the PR first thing in the morning. Thank you guys.

[mackelito]

@willshowell thx! Forgot to mention that 😁

[julianobrasil]

Fixed.

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