docs: Fix docs link to howto/README.md

[brysonshepherd]

Reason for Change: Fix docs link to howto/README.md

Issue Fixed:

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Notes:

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💖 Thanks for opening your first pull request! 💖 We use semantic commit messages to streamline the release process. Before your pull request can be merged, you should make sure your first commit and PR title start with a semantic prefix. Examples of commit messages with semantic prefixes: - fix: change azure disk cachingMode to ReadOnly - feat: make maximumLoadBalancerRuleCount configurable - docs: add note on AKS-Engine and AKS relationship
Make sure to check out the developer guide for guidance on testing your change.

[brysonshepherd]

/assign @jackfrancis

[mboersma]

/lgtm

Thanks @brysonshepherd!

[welcome]

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