Add link for backing-property-naming, correct binary-expression-wrapping

[rsmith20]

Description

Correct changelog 1.3.0 experimental property to non-experimental links.

Checklist

• [ x ] PR title is short and clear (it is used as description in the release changelog)
• [ x ] PR description added (background information)

[paul-dingemans]

Tnx. I have also updated https://github.com/pinterest/ktlint/releases/tag/1.3.0