Updated not about GDB in OS X

documentation/UserGuide.md

@@ -58,7 +58,7 @@ Whenever a launch is requested, a build will be performed beforehand. This behav
 | **Windows note:** _Using Cygwin GDB doesn't work very well, if at all. The recommended way to debug in Windows is to use the GDB of [mingw-w64](http://mingw-w64.org/), or the one of [TDM-GCC](http://tdm-gcc.tdragon.net/)._ |
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-| **OS X note:** _The GDB that is included with OS X doesn't work properly. You'll need to install the latest GDB from Homebrew. See [this article](http://ntraft.com/installing-gdb-on-os-x-mavericks/) for details. Or alternatively, [this SO link](https://stackoverflow.com/questions/33162757/how-to-install-gdb-debugger-in-mac-osx-el-capitan), which might be more up-to-date._ |
+| **OS X note:** _The GDB that is included with OS X doesn't work properly. You'll need to install the latest GDB from Homebrew or Macports. See [this SO question](https://stackoverflow.com/questions/33162757/how-to-install-gdb-debugger-in-mac-osx-el-capitan) for more up-to-date information._ |
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