Apply suggestion from @andrewjstone

Co-authored-by: Andrew J. Stone <andrew@oxidecomputer.com>

Author: labbott

nexus/types/src/deployment.rs

@@ -1624,7 +1624,7 @@ pub enum BlueprintMeasurementSetDesiredContents {
     /// variant in emergencies where the system had to be recovered via MUPdate.
     InstallDataset,
 
-    /// This measurement source source is the artifact matching this hash from the TUF
+    /// This measurement  source is the artifact matching this hash from the TUF
     /// artifact store (aka "TUF repo depot").
     ///
     /// This originates from TUF repos uploaded to Nexus which are then