docs($mdMenu): add documentation for $mdMenu

[codymikol]

currently there is no documentation.

Fixes: #11610

PR Checklist

Please check that your PR fulfills the following requirements:

• The commit message follows our guidelines
• Tests for the changes have been added or this is not a bug fix / enhancement
• Docs have been added, updated, or were not required

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Enhancement
[x] Documentation content changes
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Docs for $mdMenu are missing

Issue Number: #11610

What is the new behavior?

Added documentatiion

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[Splaktar]

Thank you for adding this. It would be nice to also link the references to the service in https://material.angularjs.org/latest/api/directive/mdMenu to this service page similar to

material/src/components/virtualRepeat/virtual-repeater.js

Lines 20 to 21 in ecf1705

	* `md-virtual-repeat-container` provides the scroll container for
	* <a ng-href="api/directive/mdVirtualRepeat">md-virtual-repeat</a>.

[Splaktar]

Please change Fixes: #11610 to Fixes #11610 in the commit message so that our changelog parsing will work properly.

[Splaktar]

Just bumping this to get your attention 😄 It would be nice to get this into 1.1.14 which may go out in the next week or two.

[codymikol]

I'll try to make these changes soon 🐔

[codymikol]

I took a bit of a break from writing software over the past few weeks, I'll try and take a look at this over this coming week. 🐔

[Splaktar]

Just a reminder that this only needs some minor tweaks before we can get it in.

[Splaktar]

@codymikol thank you for rebasing this. Do you think that you will have time to address the review feedback soon?

[codymikol]

I finally had some time and after looking at it I realized that I'm pretty much documenting the directive usage in the service docs. I spent some time trying to wrap my head around using the actual service itself and it is definitely a different process entirely. Hopefully I'll be able to take some time and play around with the actual service in a codepen this week until I feel confident enough to write the documentation for its usage.