Merge pull request #67 from gvnn3/gvnn3-patch-1

Update macos.md to indicate that Brew gdb is fine as-is now

Author: BartMassey

mdbook/src/03-setup/macos.md

@@ -5,8 +5,8 @@ All the tools can be installed using [Homebrew]:
 [Homebrew]: http://brew.sh/
 
 ``` console
-$ # Arm GCC debugger
-$ brew install arm-none-eabi-gdb
+$ # GDB debugger - The version in brew is built for all architectures including all of the ARM embedded cores
+$ brew install gdb
 
 $ # Minicom
 $ brew install minicom