fix the indentation of the example

llvm-svn: 261628
diff --git a/llvm/docs/AMDGPUUsage.rst b/llvm/docs/AMDGPUUsage.rst
index cf7dddb..5abbdec 100644
--- a/llvm/docs/AMDGPUUsage.rst
+++ b/llvm/docs/AMDGPUUsage.rst
@@ -178,5 +178,5 @@
      v_mov_b32 v2, s1
      flat_store_dword v[1:2], v0
      s_endpgm
-.Lfunc_end0:
+   .Lfunc_end0:
         .size   hello_world, .Lfunc_end0-hello_world