Correct 'teh' and other typos / repeated words.

Patch by Eitan Adler.

Differential Revision:	http://reviews.llvm.org/D8514

llvm-svn: 234939
diff --git a/llvm/docs/tutorial/LangImpl5.rst b/llvm/docs/tutorial/LangImpl5.rst
index 2dbc832..ca2ffeb 100644
--- a/llvm/docs/tutorial/LangImpl5.rst
+++ b/llvm/docs/tutorial/LangImpl5.rst
@@ -254,7 +254,7 @@
 we'll talk about #1 in depth. For now, just believe me that you don't
 need SSA construction to handle this case. For #2, you have the choice
 of using the techniques that we will describe for #1, or you can insert
-Phi nodes directly, if convenient. In this case, it is really really
+Phi nodes directly, if convenient. In this case, it is really
 easy to generate the Phi node, so we choose to do it directly.
 
 Okay, enough of the motivation and overview, lets generate code!