comments from review

Signed-off-by: Sharp <rachel.sharp@upbound.io>

content/master/concepts/composition-revisions.md

@@ -25,7 +25,7 @@ member, while individual application teams create `PlatformDB` XRs that use said
 `Composition`.
 
 Each `Composition` is mutable - you can update it as your organisation's needs
-change. However, without Composition Revisions updating can be a
+change. However, without Composition Revisions updating a `Composition` can be a
 risky process. Crossplane constantly uses the `Composition` to ensure that your
 actual infrastructure - your MySQL Servers and firewall rules - match your
 desired state. If you have 10 `PlatformDB` XRs all using the `big-platform-db`