Update build-system.rst

Rearranged few lines of folder directory description

docs/en/api-guides/build-system.rst

@@ -178,9 +178,9 @@ This example "myProject" contains the following elements:
 
 - "sdkconfig" project configuration file. This file is created/updated when ``idf.py menuconfig`` runs, and holds configuration for all of the components in the project (including ESP-IDF itself). The "sdkconfig" file may or may not be added to the source control system of the project.
 
-- Optional "components" directory contains components that are part of the project. A project does not have to contain custom components of this kind, but it can be useful for structuring reusable code or including third party components that aren't part of ESP-IDF. Alternatively, ``EXTRA_COMPONENT_DIRS`` can be set in the top-level CMakeLists.txt to look for components in other places. See the :ref:`renaming main <rename-main>` section for more info. If you have a lot of source files in your project, we recommend grouping most into components instead of putting them all in "main".
+- Optional "components" directory contains components that are part of the project. A project does not have to contain custom components of this kind, but it can be useful for structuring reusable code or including third party components that aren't part of ESP-IDF. Alternatively, ``EXTRA_COMPONENT_DIRS`` can be set in the top-level CMakeLists.txt to look for components in other places.
 
-- "main" directory is a special component that contains source code for the project itself. "main" is a default name, the CMake variable ``COMPONENT_DIRS`` includes this component but you can modify this variable.
+- "main" directory is a special component that contains source code for the project itself. "main" is a default name, the CMake variable ``COMPONENT_DIRS`` includes this component but you can modify this variable. See the :ref:`renaming main <rename-main>` section for more info. If you have a lot of source files in your project, we recommend grouping most into components instead of putting them all in "main".
 
 - "build" directory is where build output is created. This directory is created by ``idf.py`` if it doesn't already exist. CMake configures the project and generates interim build files in this directory. Then, after the main build process is run, this directory will also contain interim object files and libraries as well as final binary output files. This directory is usually not added to source control or distributed with the project source code.