Doc: Improve introductory paragraph on supporting roles

Change-Id: I3f127b0e3eedaf15fa67354286563eed2ba9981e
diff --git a/Documentation/dev-roles.txt b/Documentation/dev-roles.txt
index d052ea7..9007aa3 100644
--- a/Documentation/dev-roles.txt
+++ b/Documentation/dev-roles.txt
@@ -1,7 +1,7 @@
 = Gerrit Code Review - Supporting Roles
 
-As an open source project Gerrit has a large community of people that
-are driving the project forward and there are many ways to engage with
+As an open source project Gerrit has a large community of people
+driving the project forward. There are many ways to engage with
 the project and get involved.
 
 [[supporter]]