docs: fix typo (vercel#69731)

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Co-authored-by: Jiwon Choi <[email protected]>

docs/02-app/01-building-your-application/02-data-fetching/04-incremental-static-regeneration.mdx

@@ -189,7 +189,7 @@ Here's how this example works:
 3. After 60 seconds has passed, the next request will still show the cached (stale) page
 4. The cache is invalidated and a new version of the page begins generating in the background
 5. Once generated successfully, Next.js will display and cache the updated page
-6. If `/blog/26` is requested, Next.js will generated and cached this page on-demand
+6. If `/blog/26` is requested, Next.js will generate and cache this page on-demand
 
 ## Reference