Fix common typos in the docs.

llvm-svn: 193632
diff --git a/llvm/docs/SourceLevelDebugging.rst b/llvm/docs/SourceLevelDebugging.rst
index 05ac09c..a1d8110 100644
--- a/llvm/docs/SourceLevelDebugging.rst
+++ b/llvm/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