Uodate guidance in PR template

Author: MattIPv4

PULL_REQUEST_TEMPLATE.md

@@ -2,11 +2,19 @@
 
 Thanks for creating a pull request to request a new subdomain from JS.ORG
 
-Before creating your pull request, please complete the following steps:
+Before creating your pull request, please read and complete the following steps:
 
 - Ensure that your pull request changes only the cnames_active.js file, adding a single new line for your subdomain request
-- Tick the two checkboxes, agreeing to the sentences, below by placing an x inside the square brackets ([ ] becomes [x])
-- Add a link (GitHub repository, Vercel deployment, etc.) and explanation below for your content so we can validate your request
+  - Follow the existing format established by the other entries, a new line with the subdomain as the key and the target hostname as the value
+  - Add your new line to the file in alphabetical order, and follow the guidance given by the comments in the file itself
+
+- Fill out this pull request template in your pull request description, maintaining the format provided to you
+  - Tick the two checkboxes, agreeing to the sentences, below by placing an x inside the square brackets ([ ] becomes [x])
+  - Add a link (GitHub repository, Vercel deployment, etc.), so we can review your site
+  - Explain what your site content is and how it relates to the JavaScript community/ecosystem, so we can validate your request
+
+- Ensure that your site content follows the content requirements set out in our README: https://github.com/js-org/js.org#content-requirements
+  - Notably, make sure that your site is not a personal site, and that it is clearly content that is relevant to the JavaScript community/ecosystem
 
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