[docs] NFC: Fix links in the tutorial

r274441 introduced Chapter 10 of "Implementing a Language with LLVM" tutorial,
which caused all files in the tutorial to start using two digit numbering. But
many links were not changed and therefore appear to be broken. This patch
addresses described issue.

As a result, following command does not produce any output anymore:

$ grep -nR '<LangImpl[0-9].html>' ./docs/tutorial/

llvm-svn: 307525
diff --git a/llvm/docs/tutorial/BuildingAJIT1.rst b/llvm/docs/tutorial/BuildingAJIT1.rst
index 625cbbb..88f7aa5 100644
--- a/llvm/docs/tutorial/BuildingAJIT1.rst
+++ b/llvm/docs/tutorial/BuildingAJIT1.rst
@@ -12,7 +12,7 @@
 tutorial runs through the implementation of a JIT compiler using LLVM's
 On-Request-Compilation (ORC) APIs. It begins with a simplified version of the
 KaleidoscopeJIT class used in the
-`Implementing a language with LLVM <LangImpl1.html>`_ tutorials and then
+`Implementing a language with LLVM <LangImpl01.html>`_ tutorials and then
 introduces new features like optimization, lazy compilation and remote
 execution.
 
@@ -41,7 +41,7 @@
   a remote process with reduced privileges using the JIT Remote APIs.
 
 To provide input for our JIT we will use the Kaleidoscope REPL from
-`Chapter 7 <LangImpl7.html>`_ of the "Implementing a language in LLVM tutorial",
+`Chapter 7 <LangImpl07.html>`_ of the "Implementing a language in LLVM tutorial",
 with one minor modification: We will remove the FunctionPassManager from the
 code for that chapter and replace it with optimization support in our JIT class
 in Chapter #2.
@@ -91,8 +91,8 @@
 
 In the previous section we described our API, now we examine a simple
 implementation of it: The KaleidoscopeJIT class [1]_ that was used in the
-`Implementing a language with LLVM <LangImpl1.html>`_ tutorials. We will use
-the REPL code from `Chapter 7 <LangImpl7.html>`_ of that tutorial to supply the
+`Implementing a language with LLVM <LangImpl01.html>`_ tutorials. We will use
+the REPL code from `Chapter 7 <LangImpl07.html>`_ of that tutorial to supply the
 input for our JIT: Each time the user enters an expression the REPL will add a
 new IR module containing the code for that expression to the JIT. If the
 expression is a top-level expression like '1+1' or 'sin(x)', the REPL will also