Fix internal links in Kaleidoscope tutorial

Author: jroelofs

llvm/docs/tutorial/MyFirstLanguageFrontend/LangImpl02.rst

@@ -314,7 +314,7 @@ Now that we have all of our simple expression-parsing logic in place, we
 can define a helper function to wrap it together into one entry point.
 We call this class of expressions "primary" expressions, for reasons
 that will become more clear `later in the
-tutorial <LangImpl6.html#user-defined-unary-operators>`_. In order to parse an arbitrary
+tutorial <LangImpl06.html#user-defined-unary-operators>`_. In order to parse an arbitrary
 primary expression, we need to determine what sort of expression it is:
 
 .. code-block:: c++

llvm/docs/tutorial/MyFirstLanguageFrontend/LangImpl06.rst

@@ -113,7 +113,7 @@ keywords:
         return tok_identifier;
 
 This just adds lexer support for the unary and binary keywords, like we
-did in `previous chapters <LangImpl5.html#lexer-extensions-for-if-then-else>`_. One nice thing
+did in `previous chapters <LangImpl05.html#lexer-extensions-for-if-then-else>`_. One nice thing
 about our current AST, is that we represent binary operators with full
 generalisation by using their ASCII code as the opcode. For our extended
 operators, we'll use this same representation, so we don't need any new

llvm/docs/tutorial/MyFirstLanguageFrontend/LangImpl07.rst

@@ -399,7 +399,7 @@ the unabridged code):
       ...
 
 This code is virtually identical to the code `before we allowed mutable
-variables <LangImpl5.html#code-generation-for-the-for-loop>`_. The big difference is that we
+variables <LangImpl05.html#code-generation-for-the-for-loop>`_. The big difference is that we
 no longer have to construct a PHI node, and we use load/store to access
 the variable as needed.