[AMDGPU][MC][DOC] Updated AMD GPU assembler syntax description.

Summary of changes:
- added description of GFX10;
- added description of operands sccz, vccz, lds_direct, etc;
- minor bugfixing and improvements.

llvm-svn: 365347
diff --git a/llvm/docs/AMDGPU/gfx10_param.rst b/llvm/docs/AMDGPU/gfx10_param.rst
new file mode 100644
index 0000000..afa91e34
--- /dev/null
+++ b/llvm/docs/AMDGPU/gfx10_param.rst
@@ -0,0 +1,22 @@
+..
+    **************************************************
+    *                                                *
+    *   Automatically generated file, do not edit!   *
+    *                                                *
+    **************************************************
+
+.. _amdgpu_synid10_param:
+
+param
+===========================
+
+Interpolation parameter to read:
+
+    ============ ===================================
+    Syntax       Description
+    ============ ===================================
+    p0           Parameter *P0*.
+    p10          Parameter *P10*.
+    p20          Parameter *P20*.
+    ============ ===================================
+