Correcting several sphinx errors; should fix the LLVM documentation build.

llvm-svn: 294865

docs/AMDGPUUsage.rst

@@ -262,11 +262,12 @@ VOP_SDWA examples:
 For full list of supported instructions, refer to "Vector ALU instructions".
 
 Trap Handler ABI
---------------------------
+----------------
 The Trap Handler suppored is implemented differently based on the host OS. OS
 is obtained from the appropriate element of the target triple HSA OS:
 
 .. code-block:: c++
+
   enum TrapHandlerAbi {
     TrapHandlerAbiNone = 0,
     TrapHandlerAbiHsa = 1
@@ -276,10 +277,11 @@ is obtained from the appropriate element of the target triple HSA OS:
     return isAmdHsaOS() ? TrapHandlerAbiHsa : TrapHandlerAbiNone;
   }
 
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 For HSA OS, a trap handler is always enabled and that the following S_TRAP immediate
 operand codes are supported:
+
 .. code-block:: c++
+
   enum TrapCode {
     TrapCodeBreakPoint = 0,
     TrapCodeLLVMTrap = 1,
@@ -296,7 +298,7 @@ handled same as llvm.trap.
 - 3: Used for HSA DEBUGTRAP. queue_ptr is in SGPR0-1, the user code is in VGPR0.
 
 Graphics
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+^^^^^^^^
 For Graphics, S_ENDPGM is generated for llvm.trap. S_NOP is generated for
 llvm.debugtrap together with a warning that there is no trap handler installed.