chore: fixed typo in changelog section (vuejs#6549)

Author: vuchl

README.md

@@ -109,7 +109,7 @@ Please make sure to read the [Contributing Guide](https://github.com/vuejs/vue/b
 
 ## Changelog
 
-Details changes for each release are documented in the [release notes](https://github.com/vuejs/vue/releases).
+Detailed changes for each release are documented in the [release notes](https://github.com/vuejs/vue/releases).
 
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