fix: broken route

versioned_docs/version-4.x/migrating-existing-spas.md

@@ -34,7 +34,6 @@ and memory.
 
 Since existing SPAs are used to having an index.html file for their css, fonts,
 third party script-tags, etc., it's likely that you'll have to do some work
-to make sure all of those keep on working when your SPA becomes an html-less [
-application](building-applications.md). It is best to try to put all that
+to make sure all of those keep on working when your SPA becomes an html-less [application](building-applications.md). It is best to try to put all that
 you can into the JavaScript bundle, but your escape hatch is to put the things
 you need into your [single spa config](configuration).