Fix downgrade version wording in README.md

Author: Zandwhich

docs-site/content/29.0/api/README.md

@@ -86,7 +86,7 @@ Follow this [upgrade guide](https://typesense.org/docs/guide/updating-typesense.
 
 ## Downgrading
 
-If you wish to downgrade back to an earlier version of Typesense server, you can safely downgrade to `v28` of `v27`.
+If you wish to downgrade back to an earlier version of Typesense server, you can safely downgrade to `v28` or `v27`.
 
 :::tip
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