Fix small grammatical issue (#983)

Author: gwynne

ecosystem-steering-group/index.md

@@ -110,7 +110,7 @@ Steering Group.
 # Workgroups
 
 While the Ecosystem Steering group has purview over various areas that
-contribute to a flourishing and healthy ecosystem. Some of those areas are
+contribute to a flourishing and healthy ecosystem, some of those areas are
 already covered by existing workgroups that will fall under the governance of
 the Ecosystem Steering group. This includes:
 
@@ -200,4 +200,4 @@ The Ecosystem Steering Group follows the [Swift Code of
 Conduct](/code-of-conduct/). Instances of abusive,
 harassing, or otherwise unacceptable behavior may be reported by contacting the
 Steering Group chair or a member of the Swift Core Team or by flagging the
-behavior for moderation, whether you are the target of that behavior or not.
+behavior for moderation, whether you are the target of that behavior or not.