fix(docs): Add code block formatting to comments

This commit adds markdown code block formatting to the comments in the
bun.ts file. This improves readability and understanding of the code
usage examples provided in the comments.

packages/unplugin-typia/src/bun.ts

@@ -29,6 +29,7 @@ if (globalThis.Bun == null) {
  *     UnpluginTypia({ /* your options *\/})
  *  ]
  * })
+ * ```
  *
  * ```sh
  * $ node build.ts
@@ -47,6 +48,7 @@ if (globalThis.Bun == null) {
  *
  * plugin(UnpluginTypia({ /* your options *\/}))
  * ```
+ *
  * ```toml
  * # bunfig.toml
  * preload = ["./preload.ts"]