docs: expand abbreviation js to javascript (#12661)

readme.md

@@ -63,7 +63,7 @@ If you are not on github.com or gitlab.com, or you prefer to run your own instan
 
 - Install the `renovate` CLI tool from npmjs, run it on a schedule (e.g. using cron)
 - Run the `renovate/renovate` Docker Hub image (same content/versions as the CLI tool), run it on a schedule
-- Run the `renovate/renovate:slim` Docker Hub image if you only use package managers that don't need third party binaries (e.g. JS, Docker, NuGet, pip)
+- Run the `renovate/renovate:slim` Docker Hub image if you only use package managers that don't need third party binaries (e.g. JavaScript, Docker, NuGet, pip)
 
 [More details on the self-hosting development](https://github.com/renovatebot/renovate/blob/main/docs/usage/getting-started/running.md).