Correct typos in comment

Author: tofay

src/bin/upgrade/main.rs

@@ -224,9 +224,9 @@ impl Manifests {
     /// Update dependencies in Cargo.toml file(s) to match the corresponding
     /// version in Cargo.lock.
     fn sync_to_lockfile(self, dry_run: bool) -> Result<()> {
-        // Get locked dependencies. If there may be multiple Cargo.toml
-        // files in the workspace, then they all share the same lockfile,
-        // so it suffices to get the query metadata for any one of them.
+        // Get locked dependencies. For workspaces with multiple Cargo.toml
+        // files, there is only a single lockfile, so it suffices to get
+        // metadata for any one of Cargo.toml files.
         let (manifest, _package) = self.0.iter().next().expect("should have one");
         let mut cmd = cargo_metadata::MetadataCommand::new();
         cmd.manifest_path(manifest.path.clone());