Fix common typos in the docs.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193632 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/SourceLevelDebugging.rst b/docs/SourceLevelDebugging.rst
index 05ac09c..a1d8110 100644
--- a/docs/SourceLevelDebugging.rst
+++ b/docs/SourceLevelDebugging.rst
@@ -295,7 +295,7 @@
     i32,      ;; Index into a virtual function
     metadata, ;; indicates which base type contains the vtable pointer for the
               ;; derived class
-    i32,      ;; Flags - Artifical, Private, Protected, Explicit, Prototyped.
+    i32,      ;; Flags - Artificial, Private, Protected, Explicit, Prototyped.
     i1,       ;; isOptimized
     Function * , ;; Pointer to LLVM function
     metadata, ;; Lists function template parameters