Update _docs/concepts/build_system/index.md

Co-authored-by: FranFin <58737168+FranFin@users.noreply.github.com>

Author: pablogs9

_docs/concepts/build_system/index.md

@@ -4,7 +4,7 @@ permalink: /docs/concepts/build_system/
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 micro-ROS provides two ways of building a micro-ROS application for embedded platforms:
-- using the **micro_ros_setup** as a tool integrated in a ROS 2 workspace
+- using the **micro_ros_setup** as a tool integrated in a ROS 2 workspace.
 - using external integrations tools. Click [here](/docs/concepts/build_system/external_build_systems/) for more details about this option.
 
 **micro_ros_setup** provides a standalone build system in the form of a ROS 2 package that can be integrated in a common ROS 2 workspace. This tool is available in the [micro-ROS/micro_ros_setup](https://github.com/micro-ROS/micro_ros_setup) repository in GitHub.