remove circular reference in about-issue-and-pull-request-templates

[1ucian0]

Why:

Closes: n/a

After 21f56d5#diff-530dd4e95e916c4d7fcc376e2a4723ea67b121059a2d8eca8ae18624f2722967 , communities/using-templates-to-encourage-useful-issues-and-pull-requests/about-issue-and-pull-request-templates.md is a redirect target for /communities/using-templates-to-encourage-useful-issues-and-pull-requests/manually-creating-a-single-issue-template-for-your-repository, which is referenced in the target itself. This creates a circular reference.

What's being changed (if available, include any code snippets, screenshots, or gifs):

This PR removes the full paragraph, as it seems that the legacy path is strongly discouraged after 21f56d5#diff-530dd4e95e916c4d7fcc376e2a4723ea67b121059a2d8eca8ae18624f2722967

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

[github-actions]

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Table of review links

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The table shows the files in the content directory that were changed in this pull request. This helps you review your changes on a staging server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
communities/using-templates-to-encourage-useful-issues-and-pull-requests/about-issue-and-pull-request-templates.md	fpt ghec ghes@ 3.19 3.18 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.19 3.18 3.17 3.16 3.15 3.14

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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