[Kaleidoscope] Fix typo (#125366)

Remove duplicate word.

Author: FantasqueX

llvm/docs/tutorial/MyFirstLanguageFrontend/LangImpl09.rst

@@ -299,7 +299,7 @@ or parser so we'll need to add it.
    }
 
 In this set of code we've added some functionality on how to keep track of the
-line and column of the "source file". As we lex every token we set our current
+line and column of the "source file". As we lex every token we set our
 current "lexical location" to the assorted line and column for the beginning
 of the token. We do this by overriding all of the previous calls to
 ``getchar()`` with our new ``advance()`` that keeps track of the information