(docs) use cache: Add text code formatting (#71999)

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This PR adds missing code formatting for `revalidateTag` to the docs of
`use cache`.

Co-authored-by: Delba de Oliveira <[email protected]>

docs/02-app/02-api-reference/01-directives/use-cache.mdx

@@ -284,7 +284,7 @@ export async function getData() {
 }
 ```
 
-You can then purge the cache on-demand using revalidateTag in another function, for examples, a [route handler](/docs/app/building-your-application/routing/route-handlers) or [Server Action](/docs/app/building-your-application/data-fetching/server-actions-and-mutations):
+You can then purge the cache on-demand using `revalidateTag` in another function, for examples, a [route handler](/docs/app/building-your-application/routing/route-handlers) or [Server Action](/docs/app/building-your-application/data-fetching/server-actions-and-mutations):
 
 ```tsx filename="app/submit.ts" highlight={6,7}
 'use server'
@@ -297,7 +297,7 @@ export default async function submit() {
 }
 ```
 
-See the [revalidateTag](/docs/app/api-reference/functions/revalidateTag) docs for more information on purging cached data on-demand.
+See the [`revalidateTag`](/docs/app/api-reference/functions/revalidateTag) docs for more information on purging cached data on-demand.
 
 ## Examples