docs(faq): explain how to find version number of hosted app (#28704)

Co-authored-by: Rhys Arkins <rhys@arkins.net>

docs/usage/faq.md

@@ -36,6 +36,29 @@ The maintainers don't follow any release schedule or release cadence.
 This means the Mend Renovate App can lag a few hours to a week behind the open source version.
 Major releases of Renovate are held back until the maintainers are reasonably certain it works for most users.
 
+## How can I see which version the Mend Renovate app is using?
+
+Follow these steps to see which version the Mend Renovate app is on:
+
+1. Go to the [Mend Developer Portal](https://developer.mend.io/)
+1. Sign in to the Renovate app with your GitHub or Bitbucket account
+1. Select your organization
+1. Select a installed repository
+1. Select a job from the _Recent jobs_ overview
+1. Select the _Info_ Log Level from the dropdown menu
+1. You should see something like this:
+
+   ```
+   INFO: Repository started
+   {
+     "renovateVersion": "37.326.0"
+   }
+   ```
+
+<!-- prettier-ignore -->
+!!! tip
+    The PRs that Renovate creates have a link to the "repository job log" in the footer of the PR body text.
+
 ## Renovate core features not supported on all platforms
 
 | Feature               | Platforms which lack feature                               | See Renovate issue(s)                                        |