Link to Action View Form Helpers section in API

[mikepmunroe]

Motivation / Background

This Pull Request has been created because the Rails API Documentation link for Action View Form Helpers was linking to the base of Rails API docs. Seems like linking to the Action View Form Helpers section of the docs is preferred here.

Detail

This Pull Request changes one link in Action View Form Helpers docs.

Checklist

Before submitting the PR make sure the following are checked:

• This Pull Request is related to one change. Changes that are unrelated should be opened in separate PRs.
• Commit message has a detailed description of what changed and why. If this PR fixes a related issue include it in the commit message. Ex: [Fix #issue-number]
• Tests are added or updated if you fix a bug or add a feature.
• CHANGELOG files are updated for the changed libraries if there is a behavior change or additional feature. Minor bug fixes and documentation changes should not be included.

[zzak]

Thanks!