Update docs

README.md

@@ -1,4 +1,4 @@
-# [`Substreams`](https://substreams.streamingfast.io/) Prometheus sink module
+# [`Substreams`](https://substreams.streamingfast.io/) [Prometheus](https://prometheus.io/) sink module
 
 [<img alt="github" src="https://img.shields.io/badge/Github-substreams.prometheus-8da0cb?style=for-the-badge&logo=github" height="20">](https://github.com/pinax-network/substreams-sink-prometheus)
 [<img alt="crates.io" src="https://img.shields.io/crates/v/substreams-sink-prometheus.svg?style=for-the-badge&color=fc8d62&logo=rust" height="20">](https://crates.io/crates/substreams-sink-prometheus)
@@ -14,10 +14,11 @@
 ### Further resources
 
 - [Substreams documentation](https://substreams.streamingfast.io)
+- [Prometheus documentation](https://prometheus.io)
 
 ## 🛠 Feature Roadmap
 
-[**Gauge**](https://pkg.go.dev/github.com/prometheus/client_golang/prometheus#Gauge)
+### [Prometheus Gauge](https://pkg.go.dev/github.com/prometheus/client_golang/prometheus#Gauge)
 - [x] Set
 - [x] Inc
 - [x] Dec

src/lib.rs

@@ -8,7 +8,7 @@
 //!
 //! ## 🛠 Feature Roadmap
 //! 
-//! [**Gauge**](https://pkg.go.dev/github.com/prometheus/client_golang/prometheus#Gauge)
+//! ### [Prometheus Gauge](https://pkg.go.dev/github.com/prometheus/client_golang/prometheus#Gauge)
 //! - [x] Set
 //! - [x] Inc
 //! - [x] Dec