Fix broken link to Wiki

[paulbutcher]

The link to About-Calva-Jack-in should be (I believe!) to Connect-Calva-to-Your-Project

Fixes #.

Introduces the following change(s):

I have:

• Read How to Contribute.
• Made sure I am directing this pull request at the dev branch. (Or have specific reasons to target some other branch.)
• Made sure I am changed the default PR base branch, so that it is not master. (Sorry for the nagging.)
• Referenced the issue I am fixing/addressing in a commit message for the pull request.
  • If I am fixing the issue, I have used GitHub's fixes/closes syntax
  • If I am fixing just part of the issue, I have just referenced it w/o any of the "fixes” keywords.
• Created the issue I am fixing/addressing, if it was not present.
• Updated the [Unreleased] entry in CHANGELOG.md, linking the issue(s) that the PR is addressing.

Ping: @PEZ, @kstehn, @cfehse

[PEZ]

Thanks!