docs(guide/Components): Clear the "require" issue

[YonatanKra]

It was unclear that the required controllers are available only after the $onInit event.

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[YonatanKra]

I signed it!

On Sun, Feb 21, 2016 at 12:01 AM, googlebot [email protected]
wrote:

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#14096 (comment).

[googlebot]

CLAs look good, thanks!

[googlebot]

CLAs look good, thanks!

[gkalpak]

I tweaked it a bit and merged. Thx !
Backported to v1.5.x as 67f3e76.