Remove duplicated paragraph

Author: MikeMcC399

BUILDING.md

@@ -243,8 +243,6 @@ tarball and/or browse the git repository checked out at the relevant tag.
 
 ### Unix and macOS
 
-Developers should use the official [Install Rust](https://rust-lang.org/tools/install/)
-instructions to install a Rust toolchain, required for Temporal support introduced in Node.js 26.
 Consult the official [Install Rust](https://rust-lang.org/tools/install/)
 instructions to install a Rust toolchain, required for Temporal support introduced in Node.js 25.4.0.
 Individual packages such as `rust` and `cargo` in some operating system distributions may be considered