Refactor `client/DEVELOPMENT.md` to remove dead links

[cosmicRover]

Hey, I noticed that a few of the links inside client/DEVELOPMENT.md are broken. When I click on them I get something like this:

The urls are:

• The pull request workflow
• Set up Knative
• go mod

I propose we either remove them or have the links updated. I can go ahead and do it.

[cosmicRover]

/assign

[dsimansk]

Fixed in PR #2005.

/close

[knative-prow[bot]]

@dsimansk: Closing this issue.

In response to this:

Fixed in PR #2005.

/close

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