make it more concise

Author: devalog

fern/products/cli-api-reference/pages/commands.mdx

@@ -563,7 +563,7 @@ hideOnThisPage: true
     fern generator upgrade --include-major
     ```
 
-     Use `--include-major` to include major version upgrades. Major versions are skipped by default to prevent breaking changes (defaults to `false`).
+     Use `--include-major` to include major version upgrades. Major versions are skipped by default to prevent breaking changes.
 
   </Accordion>
 </AccordionGroup>