[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

1 files changed, 2 insertions, 2 deletions

diff --git a/llvm/docs/tutorial/LangImpl06.rst b/llvm/docs/tutorial/LangImpl06.rst
index c1035bce855..cb8ec766bb2 100644
--- a/llvm/docs/tutorial/LangImpl06.rst
+++ b/llvm/docs/tutorial/LangImpl06.rst
@@ -41,7 +41,7 @@ The point of going into user-defined operators in a tutorial like this
 is to show the power and flexibility of using a hand-written parser.
 Thus far, the parser we have been implementing uses recursive descent
 for most parts of the grammar and operator precedence parsing for the
-expressions. See `Chapter 2 <LangImpl2.html>`_ for details. By
+expressions. See `Chapter 2 <LangImpl02.html>`_ for details. By
 using operator precedence parsing, it is very easy to allow
 the programmer to introduce new operators into the grammar: the grammar
 is dynamically extensible as the JIT runs.
@@ -734,7 +734,7 @@ side-effects, but it can't actually define and mutate a variable itself.
 
 Strikingly, variable mutation is an important feature of some languages,
 and it is not at all obvious how to `add support for mutable
-variables <LangImpl7.html>`_ without having to add an "SSA construction"
+variables <LangImpl07.html>`_ without having to add an "SSA construction"
 phase to your front-end. In the next chapter, we will describe how you
 can add variable mutation without building SSA in your front-end.