Correct additional typo in README.md

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## Multi-Target Support (BETA)
**This Feature is in beta and may require changes in future releases. Feedback is welcome.**
This exporter supports the [multi-target pattern](https://prometheus.io/docs/guides/multi-target-exporter/). This allows running a single instance of this exporter for multiple postgres targets. Using the multi-target funcationality of this exporter is **optional** and meant for cases where it is impossible to install the exporter as a sidecar, for example SaaS-managed services.
This exporter supports the [multi-target pattern](https://prometheus.io/docs/guides/multi-target-exporter/). This allows running a single instance of this exporter for multiple postgres targets. Using the multi-target functionality of this exporter is **optional** and meant for cases where it is impossible to install the exporter as a sidecar, for example SaaS-managed services.
To use the multi-target functionality, send an http request to the endpoint `/probe?target=foo:5432` where target is set to the DSN of the postgres instance to scrape metrics from.