chore(docs):update unpublish cooldown

PR-URL: #2778
Credit: @christoflemke
Close: #2778
Reviewed-by: @wraithgar, @ethomson

docs/content/commands/npm-unpublish.md

@@ -42,7 +42,7 @@ versions then the registry will remove the root package entry entirely.
 Even if you unpublish a package version, that specific name and version
 combination can never be reused. In order to publish the package again,
 you must use a new version number. If you unpublish the entire package,
-you may not publish any new versions of that package until 24 hours have
+you may not publish any new versions of that package until 28 days have
 passed.
 
 ### See Also