docs: update default for optimizeDeps.disabled (#9078)

Author: IanVS

packages/vite/src/node/optimizer/index.ts

@@ -122,8 +122,8 @@ export interface DepOptimizationConfig {
   /**
    * Disables dependencies optimizations, true disables the optimizer during
    * build and dev. Pass 'build' or 'dev' to only disable the optimizer in
-   * one of the modes. Deps optimization is enabled by default in both
-   * @default false
+   * one of the modes. Deps optimization is enabled by default in dev only.
+   * @default 'build'
    * @experimental
    */
   disabled?: boolean | 'build' | 'dev'