docs(test-snapshots-js.md): Add link to snapshotPathTemplate (#29727)

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@ -44,6 +44,8 @@ The snapshot name `example-test-1-chromium-darwin.png` consists of a few parts:
- `chromium-darwin` - the browser name and the platform. Screenshots differ between browsers and platforms due to different rendering, fonts and more, so you will need different snapshots for them. If you use multiple projects in your [configuration file](./test-configuration.md), project name will be used instead of `chromium`.
The snapshot name and path can be configured with [`snapshotPathTemplate`](./api/class-testproject#test-project-snapshot-path-template) in the playwright config.
## Updating screenshots
Sometimes you need to update the reference screenshot, for example when the page has changed. Do this with the `--update-snapshots` flag.