Add README for 'What's New in Grafana Cloud' contributions (#73403)

* Add README for 'What's New in Grafana Cloud' contributions

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

* Apply suggestions from code review

Co-authored-by: Isabel <76437239+imatwawana@users.noreply.github.com>

* Use more consistent variable names

* Reconcile template and example

Co-authored-by: Isabel <76437239+imatwawana@users.noreply.github.com>

* Add highlighting to example

* Be explict about cloud offering options

Co-authored-by: Isabel <76437239+imatwawana@users.noreply.github.com>

* Prettier

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

---------

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>
Co-authored-by: Isabel <76437239+imatwawana@users.noreply.github.com>

docs/sources/whatsnew/whats-new-next/README.md

@@ -0,0 +1,74 @@
+# Contribute to 'What's New in Grafana Cloud'
+
+To have a feature presented in [What's New in Grafana Cloud](https://grafana.com/docs/grafana-cloud/whatsnew/), add an entry to the [`index.md`](./index.md) file in this directory.
+
+Use the following template, replace any `<VARIABLE>` with the appropriate text (explained after the template):
+
+```markdown
+## <FEATURE>
+
+<!-- <CONTRIBUTOR> -->
+<!-- <ON-PREMISE OFFERING> -->
+
+_Available in <CLOUD AVAILABILITY> in Grafana <CLOUD OFFERING>_
+
+<DESCRIPTION>
+```
+
+## _`CONTRIBUTOR`_
+
+The name of the contributor of the feature.
+The information is intentionally commented out so that it isn't displayed in the published page.
+
+## _`ON-PREMISE OFFERING`_
+
+One or both of:
+
+- OSS
+- Enterprise
+
+Intended availability of the feature when released outside of Grafana Cloud.
+The information is intentionally commented out so that it isn't displayed in the published page.
+If the feature is not going to be released outside of Grafana Cloud, omit the HTML comment entirely.
+
+## _`CLOUD AVAILABILITY`_
+
+One of the following [release life cycle stages](https://grafana.com/docs/release-life-cycle/):
+
+- Generally available
+- Available in public preview
+- Available in private preview
+- Experimental
+
+## _`CLOUD OFFERING`_
+
+List the appropriate combination of:
+
+- Cloud Free
+- Cloud Pro
+- Cloud Advanced
+
+Or if all three:
+
+- Cloud
+
+## _`DESCRIPTION`_
+
+Include an overview of the feature and problem it solves, and where to learn more.
+Link to any appropriate documentation.
+You must use relative path references when linking to documentation within the Grafana repository.
+Use the Hugo `relref` shortcode for build time link checking.
+For more information about the `relref` shortcode, refer to [Links and references](https://grafana.com/docs/writers-toolkit/writing-guide/references/).
+
+## Example
+
+```markdown
+## Updated navigation
+
+<!-- Jack Baldry -->
+<!-- OSS, Enterprise -->
+
+_Available in public preview in Grafana Cloud Pro and Advanced_
+
+The navigation in Grafana Cloud has been updated in the following ways...
+```

docs/sources/whatsnew/whats-new-next/index.md

@@ -16,14 +16,3 @@ weight: -37
 # What’s new in Grafana Cloud
 
 Welcome to Grafana Cloud! Read on to learn about the newest changes to Grafana Cloud.
-
-<!-- Template below
-## Feature
-<!-- Name of contributor commented out -->
-<!-- Availability in OSS and Enterprise (for later) commented out -->
-<!-- [Generally available | Available in private/public preview | Experimental] in Grafana [Cloud Free | Cloud Pro | Cloud Advanced | Cloud]
-Description. Include an overview of the feature and problem it solves, and where to learn more (like a link to the docs).
-{{% admonition type="note" %}}
-You must use relative references when linking to docs within the Grafana repo. Please do not use absolute URLs. For more information about relrefs, refer to [Links and references](/docs/writers-toolkit/writing-guide/references/).
-{{% /admonition %}}
--->