docs: update task output caching guide (#1639)

Hey there,

I saw on https://viteplus.dev/guide/cache it says:
> <img width="740" height="171" alt="Screenshot 2026-05-20 at 10 18
29 AM"
src="https://github.com/user-attachments/assets/b5718eda-dbe4-4ccc-b106-3e61bd5a825c"
/>

Talking with Evan, I learned this behavior _does_ exist and the docs
aren't accurate.

Looks like voidzero-dev/vite-task#375 added the functionality &
#1628 brought it in.

Co-authored-by: MK (fengmk2) <fengmk2@gmail.com>

Author: ericclemmons

docs/guide/cache.md

@@ -13,9 +13,18 @@ When a task runs successfully (exit code 0), its terminal output (stdout/stderr)
 If everything matches, the cached output is replayed instantly, and the command does not run.
 
 ::: info
-Currently, only terminal output is cached and replayed. Output files such as `dist/` are not cached. If you delete them, use `--no-cache` to force a re-run. Output file caching is planned for a future release.
+By default, only terminal output is cached and replayed. To cache files produced by a task, configure [`output`](/config/run#output) globs. Matching files are archived after a successful run and restored on a cache hit.
 :::
 
+```ts [vite.config.ts]
+tasks: {
+  build: {
+    command: 'vp build',
+    output: ['dist/**'],
+  },
+}
+```
+
 When a cache miss occurs, Vite Task tells you exactly why:
 
 ```