Use correct capitalization.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158752 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/Projects.rst b/docs/Projects.rst
index ea94ffd..c4be6da 100644
--- a/docs/Projects.rst
+++ b/docs/Projects.rst
@@ -280,7 +280,7 @@
     For example, to link ``libsample.so``, you would have the following line in
     your ``Makefile``:
 
-        .. code-block:: Makefile
+        .. code-block:: makefile
 
           LIBS += -lsample