[yaml2obj][ELF] Don't explicitly set `Binding` with STB_*

Instead, just have 3 sub-lists, one for each of
{STB_LOCAL,STB_GLOBAL,STB_WEAK}.

This allows us to be a lot more explicit w.r.t. the symbol ordering in
the object file, because if we allowed explicitly setting the STB_*
`Binding` key for the symbol, then we might have ended up having to
shuffle STB_LOCAL symbols to the front of the list, which is likely to
cause confusion and potential for error.

Also, this new approach is simpler ;)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184506 91177308-0d34-0410-b5e6-96231b3b80d8
[docs] Fix formatting.

'\n' was displaying as 'n'

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184507 91177308-0d34-0410-b5e6-96231b3b80d8