Fix spelling mistake.

spec/models/repository_spec.rb

@@ -668,8 +668,8 @@ describe Repository do
       expect(results.first).to eq('files/html/500.html')
     end
-    it 'ignores root slash' do
-      result = repository.search_files_by_name('/files', 'master')
+    it 'ignores leading slashes' do
+      results = repository.search_files_by_name('/files', 'master')
       expect(results.first).to eq('files/html/500.html')
     end