copy edits to who uses carbon (#2347)

src/pages/all-about-carbon/who-uses-carbon.mdx

@@ -27,12 +27,6 @@ comes in.
 
 </AnchorLinks>
 
-## Overview
-
-Carbon provides the building blocks that allow product teams to build
-consistent, branded solutions to complex problems. Let's look at how different
-team members use Carbon, what the benefits are, and how you can get started.
-
 ## Designers
 
 Designers are passionate advocates for users, and Carbon helps them provide
@@ -52,8 +46,6 @@ to explore and deliver the full potential of a design, leveraging the work of
 other teams where possible, avoiding redesign and duplication of efforts,
 keeping the focus on the distinct client use cases.
 
-### How designers can engage with Carbon
-
 Here are some ways designers can begin engaging with Carbon.
 
 #### Learn the system
@@ -131,8 +123,6 @@ Developers can create products that are cohesive with other business
 units—high-quality, consistent, and robust front-end experiences that share the
 IBM brand.
 
-### How developers can engage with Carbon
-
 Here are some ways developers can begin engaging with Carbon.
 
 #### Learn the system