docs(mend-hosted): add information about IPs the Developer Platform uses

As per #39746

Author: jamietanna

docs/usage/mend-hosted/overview.md

@@ -57,3 +57,12 @@ Details of the Mend Renovate Cloud versions are shown in the table below.
     OSS-licensed orgs can request increased resources on Mend Renovate Community Cloud.
     To request increased resources, create a “[Suggest an Idea](https://github.com/renovatebot/renovate/discussions/categories/suggest-an-idea)” item on the Renovate discussions board on GitHub.
     Acceptance is at the discretion of Mend.io.
+
+## IP Addresses used
+
+If you are looking at restricting access to your source code via IP allowlisting, you will need to know which public IPs Mend's Developer Platform accesses from.
+
+These can be found documented [on the Mend docs site](https://docs.mend.io/platform/latest/ip-addresses-used-by-mend-io) under the `developer-platform` section.
+
+- the `us` grouping is for [`developer.mend.io`](https://developer.mend.io/)
+- the `eu` grouping is for [`developer-eu.mend.io/`](https://developer-eu.mend.io/)