Fix table of contents in Introduction to the buildsystem

This fixes a regression introduced in
351893b13d7c86a47002ccbd0adfcaf7533bcbfd.

development/compiling/introduction_to_the_buildsystem.rst

@@ -212,16 +212,6 @@ directory paths containing such modules:
 
     :ref:`doc_custom_modules_in_c++`
 
-Other build options
--------------------
-
-There are several other build options that you can use to configure the
-way Godot should be built (compiler, debug options, etc.) as well as the
-features to include/disable.
-
-Check the output of ``scons --help`` for details about each option for
-the version you are willing to compile.
-
 Cleaning generated files
 ------------------------
 
@@ -234,6 +224,16 @@ for all platforms and configurations. Beware, as this will remove all untracked
 and ignored files in the repository. Don't run this command if you have
 uncommitted work!
 
+Other build options
+-------------------
+
+There are several other build options that you can use to configure the
+way Godot should be built (compiler, debug options, etc.) as well as the
+features to include/disable.
+
+Check the output of ``scons --help`` for details about each option for
+the version you are willing to compile.
+
 .. _doc_overriding_build_options:
 
 Overriding the build options