fix: slight formatting fix

Remove extra newline in package_update.md

Author: jshackell-sfdc

messages/package_update.md

@@ -46,7 +46,6 @@ ID of the package version that's installed when subscribers click the Upgrade to
 
 Specify the recommended package version for subscribers to install. If a subscriber has a package version installed in their org that's lower than the version you set, the subscriber sees the Upgrade to Recommended Version option on the Installed Packages page. Only released package versions can be set as the recommended version.
 
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 # flags.skip-ancestor-check.summary
 
 Bypass the ancestry check for setting a recommended version.