Bug 774109 - Fix typos in OS X mozboot backend; r=me DONTBUILD

Typos were trivial and weren't worth finding a reviewer for.

--HG--
extra : rebase_source : 40f039121aa5efd710449cff726ac5521f92b7fe

python/mozboot/mozboot/osx.py

@@ -30,7 +30,7 @@ through the App Store.
 '''
 
 XCODE_REQUIRED_LEGACY = '''
-You will need to download nad install Xcode to build Firefox.
+You will need to download and install Xcode to build Firefox.
 
 Please complete the Xcode download and then relaunch this script.
 '''
@@ -201,6 +201,6 @@ class OSXBootstrapper(BaseBootstrapper):
         if self.os_version < 7 and 'llvm' not in installed:
             print(HOMEBREW_OLD_CLANG)
 
-            subprocess.check_call([brew, '-v' 'install', 'llvm',
+            subprocess.check_call([brew, '-v', 'install', 'llvm',
                 '--with-clang', '--all-targets'])