Add note that the SDK uses the onboarding library

[alexandratran]

Add note at the top of the onboarding library page that the SDK incorporates the onboarding functionality. Fixes #87.

Preview: https://metamask.github.io/mm-docs-v2/87-onboarding/wallet/how-to/use-onboarding-library

[alexandratran]

@metamaskbot publish-preview

[github-actions[bot]]

Preview published: preview/ea8d619d9dda5a9b0d39344fc7360e7f7f84d442

[vandan]

I didn't see a lot of guidance in the old docs either, but I'm wondering if there are some hints about how to utilize the features that are in the onboarding library from the SDK.

cc @httpJunkie @andrepimenta who may know more

[github-actions[bot]]

Preview published: 87-onboarding

[vandan]

Looks like it auto-detects the origin so maybe there's not much more to explain here.

[github-actions[bot]]

Preview published: 87-onboarding