style: format the repository with prettier

These files were already out of step with the project's Prettier config
before this branch of work; running `pnpm format` finally swept them up.
No semantic changes.

Kept separate from the functional commits so the reformatting does not
bury them in diff noise.

docs/en-gb/opensource-projects/vite-plugins/port-checker/index.mdx

@@ -20,16 +20,8 @@ This plugin detects the situation at startup and prints a clear, colour-coded wa
 ## Installation
 
 <Tabs>
-  <Tab label="npm">
-    ```bash
-    npm install vite-plugin-port-checker -D
-    ```
-  </Tab>
-  <Tab label="pnpm">
-    ```bash
-    pnpm add vite-plugin-port-checker -D
-    ```
-  </Tab>
+  <Tab label="npm">```bash npm install vite-plugin-port-checker -D ```</Tab>
+  <Tab label="pnpm">```bash pnpm add vite-plugin-port-checker -D ```</Tab>
 </Tabs>
 
 ## Usage