Links in Pull Request template are deprecated

[ebroda]

Bug Report

Describe the Bug

If you open a new pull request, the template includes two links. One links to an old file and one is broken.

The template is located here:
https://github.com/eclipse-edc/.github/blob/main/.github/PULL_REQUEST_TEMPLATE.md

Expected Behavior

Working links, directly giving the expected pages.

• https://eclipse-edc.github.io/documentation/for-contributors/guidelines/#submitting-a-pull-request
• https://eclipse-edc.github.io/documentation/for-contributors/guidelines/pr-etiquette/

Observed Behavior

Links are broken.

Steps to Reproduce

Steps to reproduce the behavior:

1. Create a new pull request OR open the template linked above.
2. Click any of the two links.

Context Information

not applicable

Detailed Description

not applicable

Possible Implementation

Replace links with links given above.

[github-actions]

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