## What changes were proposed in this pull request?

Recently, I found two unreachable links in the document and fixed them.
Because of small changes related to the document, I don't file this issue in JIRA but please suggest I should do it if you think it's needed.

## How was this patch tested?

Tested manually.

Author: Kousuke Saruta <sarutak@oss.nttdata.co.jp>

Closes #19195 from sarutak/fix-unreachable-link.