Fix 2 RestructuredText warnings.

llvm/docs/CommandGuide/llvm-nm.rst

@@ -131,6 +131,7 @@ OPTIONS
  Specify the type of XCOFF object file, ELF object file, or IR object file input
  from command line or from archive files that llvm-nm should examine. The
  mode must be one of the following:
+ 
    32
          Process only 32-bit object files.
    64

llvm/docs/LangRef.rst

@@ -2517,7 +2517,7 @@ Pointer Authentication Operand Bundles
 
 Pointer Authentication operand bundles are characterized by the
 ``"ptrauth"`` operand bundle tag.  They are described in the
-`Pointer Authentication <PointerAuth.html#operand-bundle>`_ document.
+`Pointer Authentication <PointerAuth.html#operand-bundle>`__ document.
 
 .. _moduleasm: