fix(blocks): Mark previously-@private methods @internal

[cpcallen]

The basics

• I branched from develop
• My pull request is against develop
• My code follows the style guide
• I ran npm run format and npm run lint

The details

Proposed Changes

Where certain block mixin methods had been marked @private, and these annotations had been deleted while migrating the containing files to TypeScript, mark those methods as @internal.

Behaviour Before Change

These methods might have appeared in our .d.ts files and external documentation.

Behaviour After Change

These methods should not appear in our d.ts files or external documentation.

Reason for Changes

The migration PRs were not intended to change any API.

Test Coverage

Passes npm test. No changes to manual testing required.

Documentation

…may be sparser than before, intentionally.

Additional Information

I'm not actually sure if these methods appear in our external documentation at the moment—I'd guess not. But better to keep it that way.

[BeksOmega]

One meta comment: Make sure to put @private and @internal in back ticks, otherwise we @ people we don't want to :P

[cpcallen]

One meta comment: Make sure to put @private and @internal in back ticks, otherwise we @ people we don't want to

Oops. But also: whoever started using @username instead of username@ gets a big ಠ_ಠ from me.