[BUGFIX]Fix broken method link

[akashdsouza]

#318

[sivakumar-kailasam]

@akashdsouza thanks for the PR, the review app is deployed at https://ember-api-docs-staging-pr-319.herokuapp.com/api/ember/2.14/namespaces/Ember.computed/methods?anchor= .

The page used to scroll to the methods tab in view which was the previous behavior until commit 3736291. This can be seen at https://ember-api-docs-staging.herokuapp.com/api/ember/2.14/classes/Ember.Component/methods?anchor=. Can you please try addressing it as a part of this PR?

[akashdsouza]

@MartinMalinda, as discussed on slack, I have added manual scrolling. If this looks ok, I can add the same to /methods under classes and modules(perhaps in a mixin?).
I have also been trying to add test cases for the same. However, when didTransition action fires, the page is still in loading state. I'm not sure what's causing this.

[akashdsouza]

Since this has become stale for some time, I cherry-picked the autoscroll issue fix commit and created a separate PR( #321 ). This way, we can fix the broken links immediately.