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/LangImpl7.rst b/llvm/docs/tutorial/LangImpl7.rst
index c445908..6489407 100644
--- a/llvm/docs/tutorial/LangImpl7.rst
+++ b/llvm/docs/tutorial/LangImpl7.rst
@@ -632,7 +632,7 @@
 User-defined Local Variables
 ============================
 
-Adding var/in is just like any other other extensions we made to
+Adding var/in is just like any other extension we made to
 Kaleidoscope: we extend the lexer, the parser, the AST and the code
 generator. The first step for adding our new 'var/in' construct is to
 extend the lexer. As before, this is pretty trivial, the code looks like