Docs: fix inverted markdown link format in Mix.Tasks.Xref (#14458)

Author: abreujp

lib/mix/lib/mix/tasks/xref.ex

@@ -383,7 +383,7 @@ defmodule Mix.Tasks.Xref do
           lib/b.ex
           lib/a.ex (compile)
 
-  More precisely, `xref` is printing the (strongly connected components)[https://en.wikipedia.org/wiki/Strongly_connected_component]
+  More precisely, `xref` is printing the [strongly connected components](https://en.wikipedia.org/wiki/Strongly_connected_component)
   in the dependency graph, which is (roughly speaking) the largest set of
   files which are part of a dependency cycle involving these files.