Correct Next.js 9 upgrade instructions (vercel#26271)

The upgrade instructions from version 9 to version 10 still had the `@latest` tag. This PR changes it to use `@10`
blitz-js · Jun 17, 2021 · 913bd7b · 913bd7b
1 parent deeb243
commit 913bd7b
Showing 1 changed file with 7 additions and 1 deletion.
diff --git a/docs/upgrading.md b/docs/upgrading.md
@@ -142,7 +142,13 @@ There were no breaking changes between version 9 and 10.
 To upgrade run the following command:
 
 ```
-npm install next@latest
+npm install next@10
+```
+
+Or using `yarn`:
+
+```
+yarn add next@10
 ```
 
 ## Upgrading from version 8 to 9