chore(docs): Updated release notes for trailing slash (#34768)

* Updated release notes for trailing slash

Currently in public beta - we don't want to set the wrong expectation with our users. Thanks!

* Lint fix

Co-authored-by: Josh <[email protected]>

Author: pragmaticpat

docs/docs/reference/release-notes/v4.7/index.md

@@ -8,7 +8,7 @@ Welcome to `[email protected]` release (February 2022 #1)
 
 Key highlights of this release:
 
-- [`trailingSlash` Option](#trailingslash-option) - Now built into the Framework itself
+- [`trailingSlash` Option (Beta)](#trailingslash-option) - Now built into the Framework itself
 - [Faster Schema Creation & `createPages`](#faster-schema-creation--createpages) - Speed improvements of at least 30%
 
 Also check out [notable bugfixes](#notable-bugfixes--improvements).
@@ -24,6 +24,8 @@ if you have any [issues](https://github.com/gatsbyjs/gatsby/issues).
 
 ## `trailingSlash` Option
 
+_Currently in public Beta_
+
 Through the RFC [Integrated handling of trailing slashes in Gatsby](https://github.com/gatsbyjs/gatsby/discussions/34205) we've worked on making the trailing slashes feature a first-class citizen in Gatsby. We're happy to announce that `gatsby-config` now supports a `trailingSlash` configuration with these three main options:
 
 - `always`: Always add trailing slashes to each URL, e.g. `/x` to `/x/`.
@@ -46,6 +48,8 @@ Please note that these plugins are considered deprecated now: [gatsby-plugin-for
 
 The information presented here is also available in the [gatsby-config docs page](/docs/reference/config-files/gatsby-config/#trailingslash) and in the [PR #34268](https://github.com/gatsbyjs/gatsby/pull/34268) that implemented this.
 
+Please share your feedback and any issues you encounter directly into the [corresponding discussion](https://github.com/gatsbyjs/gatsby/discussions/34205).
+
 ## Faster Schema Creation & `createPages`
 
 We've seen a handful of sites struggling with long `schema building` and `createPages` steps. In this release, we've upgraded our external [`graphql-compose`](https://graphql-compose.github.io/) dependency to v9 to improve these steps by at least 30-50% for schemas/queries with many relationships. For example, one of our customers has seen improvements for `createPages` of 786s to 20s. This update is recommended to everyone and doesn't necessitate any changes on your end.