docs: Update Husky setup commands for PNPM users (#16943)

- Replace `npx husky init` with `pnpm exec husky init`
- Update installation command to use pnpm
- Add PNPM-specific pre-commit hook setup command

docs/install.md

@@ -151,7 +151,7 @@ For example, you can do the following to have Prettier run before each commit:
 
    ```bash
    pnpm add --save-dev husky lint-staged
-   npx husky init
+   pnpm exec husky init
    node --eval "fs.writeFileSync('.husky/pre-commit','pnpm exec lint-staged\n')"
    ```