Update README.md

Author: pixlwave

Tools/Scripts/README.md

@@ -16,5 +16,5 @@ To make the release you will need the following installed:
 1. Set `api.github.com` in your .netrc file before using
 2. cargo + rustup https://www.rust-lang.org/tools/install
 3. matrix-rust-sdk cloned next to this repo `git clone https://github.com/matrix-org/matrix-rust-sdk`
-4. Checkout the `main` branch of the SDK. Using a different branch will result in the wrong commit SHA.
+4. Checkout the `main` branch of the SDK (or another custom branch to release from).
 5. Any dependencies required to build the matrix-rust-sdk as mentioned in the [Apple platforms readme](https://github.com/matrix-org/matrix-rust-sdk/blob/main/bindings/apple/README.md).