Fix spelling: sucessfully -> successfully

Originally from gitlab-org/gitlab-ee!682

app/controllers/projects/builds_controller.rb

@@ -74,7 +74,7 @@ class Projects::BuildsController < Projects::ApplicationController
   def erase
     @build.erase(erased_by: current_user)
     redirect_to namespace_project_build_path(project.namespace, project, @build),
-                notice: "Build has been sucessfully erased!"
+                notice: "Build has been successfully erased!"
   end
 
   def raw

app/views/profiles/update_username.js.haml

 - if @user.valid?
   :plain
-    new Flash("Username sucessfully changed", "notice")
+    new Flash("Username successfully changed", "notice")
 - else
   :plain
     new Flash("Username change failed - #{@user.errors.full_messages.first}", "alert")