Fix command to delete local turborepo cache (#3109)

It was in a fenced code block on a single line, which was causing `sh`
to be present at the beginning of each command (very confusing and hard
to catch).

_On a completely unrelated topic..._ (content warning: sarcasm)

_I used [StackBlitz Codeflow](https://stackblitz.com/codeflow/) to make
this PR, and `pnpm run docs` did not work because `make` isn't available
(Codeflow uses a technology called
[WebContainers](https://blog.stackblitz.com/posts/introducing-webcontainers/),
which runs entirely in the browser). I think we should port Make, the
Rust compiler, Cargo and anything needed to compile Turbo to Web
Assembly and/or JavaScript, so that we can run the whole toolchain in
the browser. Sounds pretty easy honestly 👍_

Co-authored-by: Thomas Knickman <tom.knickman@vercel.com>

docs/pages/repo/docs/core-concepts/remote-caching.mdx

@@ -61,8 +61,16 @@ Your cache artifacts will now be stored locally _and_ in your Remote Cache.
 To verify, delete your local Turborepo cache with:
 
 <Tabs items={["unix", "win"]} storageKey="selected-os">
-  <Tab>```sh rm -rf ./node_modules/.cache/turbo ```</Tab>
-  <Tab>```sh rd /s /q "./node_modules/.cache/turbo" ```</Tab>
+  <Tab>
+    ```sh
+    rm -rf ./node_modules/.cache/turbo
+    ```
+  </Tab>
+  <Tab>
+    ```sh
+    rd /s /q "./node_modules/.cache/turbo"
+    ```
+  </Tab>
 </Tabs>
 
 Then run the same build again. If things are working properly, `turbo` should not execute tasks locally, but rather download both the logs and artifacts from your Remote Cache and replay them back to you.