'Hexadecimal' has two 'a's and only one 'i'.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176031 91177308-0d34-0410-b5e6-96231b3b80d8
ARM build docs easier for copy&paste

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176033 91177308-0d34-0410-b5e6-96231b3b80d8