Update Rust setup instructions in template guide (#1006)

* add install command

* add llms files

Author: wirednkod

llms-files/llms-basics.txt

@@ -2961,6 +2961,7 @@ For this tutorial series, you need to use Rust `1.86`. Newer versions of the com
 === "macOS"
 
     ```bash
+    rustup install 1.86
     rustup default 1.86
     rustup target add wasm32-unknown-unknown --toolchain 1.86-aarch64-apple-darwin
     rustup component add rust-src --toolchain 1.86-aarch64-apple-darwin

llms-files/llms-dapps.txt

@@ -6356,6 +6356,7 @@ For this tutorial series, you need to use Rust `1.86`. Newer versions of the com
 === "macOS"
 
     ```bash
+    rustup install 1.86
     rustup default 1.86
     rustup target add wasm32-unknown-unknown --toolchain 1.86-aarch64-apple-darwin
     rustup component add rust-src --toolchain 1.86-aarch64-apple-darwin

llms-files/llms-infrastructure.txt

@@ -5483,6 +5483,7 @@ For this tutorial series, you need to use Rust `1.86`. Newer versions of the com
 === "macOS"
 
     ```bash
+    rustup install 1.86
     rustup default 1.86
     rustup target add wasm32-unknown-unknown --toolchain 1.86-aarch64-apple-darwin
     rustup component add rust-src --toolchain 1.86-aarch64-apple-darwin

llms-files/llms-networks.txt

@@ -3413,6 +3413,7 @@ For this tutorial series, you need to use Rust `1.86`. Newer versions of the com
 === "macOS"
 
     ```bash
+    rustup install 1.86
     rustup default 1.86
     rustup target add wasm32-unknown-unknown --toolchain 1.86-aarch64-apple-darwin
     rustup component add rust-src --toolchain 1.86-aarch64-apple-darwin

llms-files/llms-parachains.txt

@@ -9089,6 +9089,7 @@ For this tutorial series, you need to use Rust `1.86`. Newer versions of the com
 === "macOS"
 
     ```bash
+    rustup install 1.86
     rustup default 1.86
     rustup target add wasm32-unknown-unknown --toolchain 1.86-aarch64-apple-darwin
     rustup component add rust-src --toolchain 1.86-aarch64-apple-darwin
@@ -12613,6 +12614,7 @@ For this tutorial series, you need to use Rust `1.86`. Newer versions of the com
 === "macOS"
 
     ```bash
+    rustup install 1.86
     rustup default 1.86
     rustup target add wasm32-unknown-unknown --toolchain 1.86-aarch64-apple-darwin
     rustup component add rust-src --toolchain 1.86-aarch64-apple-darwin

llms-files/llms-polkadot-protocol.txt

@@ -9639,6 +9639,7 @@ For this tutorial series, you need to use Rust `1.86`. Newer versions of the com
 === "macOS"
 
     ```bash
+    rustup install 1.86
     rustup default 1.86
     rustup target add wasm32-unknown-unknown --toolchain 1.86-aarch64-apple-darwin
     rustup component add rust-src --toolchain 1.86-aarch64-apple-darwin

llms-files/llms-smart-contracts.txt

@@ -7885,6 +7885,7 @@ For this tutorial series, you need to use Rust `1.86`. Newer versions of the com
 === "macOS"
 
     ```bash
+    rustup install 1.86
     rustup default 1.86
     rustup target add wasm32-unknown-unknown --toolchain 1.86-aarch64-apple-darwin
     rustup component add rust-src --toolchain 1.86-aarch64-apple-darwin

llms-files/llms-tooling.txt

@@ -18267,6 +18267,7 @@ For this tutorial series, you need to use Rust `1.86`. Newer versions of the com
 === "macOS"
 
     ```bash
+    rustup install 1.86
     rustup default 1.86
     rustup target add wasm32-unknown-unknown --toolchain 1.86-aarch64-apple-darwin
     rustup component add rust-src --toolchain 1.86-aarch64-apple-darwin

llms-full.txt

@@ -39407,6 +39407,7 @@ For this tutorial series, you need to use Rust `1.86`. Newer versions of the com
 === "macOS"
 
     ```bash
+    rustup install 1.86
     rustup default 1.86
     rustup target add wasm32-unknown-unknown --toolchain 1.86-aarch64-apple-darwin
     rustup component add rust-src --toolchain 1.86-aarch64-apple-darwin

tutorials/polkadot-sdk/parachains/zero-to-hero/set-up-a-template.md

@@ -36,6 +36,7 @@ For this tutorial series, you need to use Rust `1.86`. Newer versions of the com
 === "macOS"
 
     ```bash
+    rustup install 1.86
     rustup default 1.86
     rustup target add wasm32-unknown-unknown --toolchain 1.86-aarch64-apple-darwin
     rustup component add rust-src --toolchain 1.86-aarch64-apple-darwin