[6582] fix: Broken Link in Issue Template Documentation (#6615)

### What changes were proposed in this pull request?

This PR fixes a broken link in the issue template documentation. The
updated link correctly directs users to the structured issue template
documentation.

### Why are the changes needed?

The link should direct users to the correct documentation on structured
issue templates.

fix #6582 , closes #6583 

### Does this PR introduce _any_ user-facing change?

No. This is a documentation fix and does not impact any user-facing
functionality.

### How was this patch tested?

Since this is a documentation update, no functional tests were required.
However, the updated link was manually verified to ensure it directs
users to the correct documentation.

.github/ISSUE_TEMPLATE/improvement.yml

@@ -1,4 +1,4 @@
-# See https://gh-community.github.io/issue-template-feedback/structured/
+# See https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/configuring-issue-templates-for-your-repository
 
 name: Improvement
 title: "[Improvement] "