issue-3260: Clarify a few points on Development Documentation.

[jgao1025]

What type of PR is this?
/kind documentation

What this PR does / why we need it:

As a new contributor, I reviewed the Dev Guide and would like to clarify a few points I encountered while following it. I've made some structural adjustments and added a few pieces of content. I know that this may have some personal opinions, so I'm open to any feedback or comments.

Which issue(s) this PR fixes:

Fixes #3260

Does this PR introduce a user-facing change?:
NONE

Dear reviewers,

You can check the latest changes at here.

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[k8s-ci-robot]

Hi @jgao1025. Thanks for your PR.

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[youngnick]

/ok-to-test
/approve

Thanks @jgao1025, this is great stuff.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jgao1025, youngnick

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[mlavacca]

Thanks for this PR, @jgao1025!

[robscott]

This is really great, thanks @jgao1025!

/lgtm