Merge pull request kubernetes#53286 from xiangpengzhao/fix-changelogmd

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Fix bad format of 1.8 release notes

**What this PR does / why we need it**:
Some links have bad format, this PR fixes them.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #

**Special notes for your reviewer**:
/cc @abgworrall 

**Release note**:

```release-note
NONE
```