Add a missing space in comment.

PiperOrigin-RevId: 325487455
diff --git a/src/main/java/com/google/devtools/build/lib/skyframe/TreeArtifactValue.java b/src/main/java/com/google/devtools/build/lib/skyframe/TreeArtifactValue.java
index 6727ecf..ec36e83 100644
--- a/src/main/java/com/google/devtools/build/lib/skyframe/TreeArtifactValue.java
+++ b/src/main/java/com/google/devtools/build/lib/skyframe/TreeArtifactValue.java
@@ -370,7 +370,7 @@
         fingerprint.addPath(childData.getKey().getParentRelativePath());
         childData.getValue().addTo(fingerprint);
 
-        // Tolerate a mix of local and remote children(b/152496153#comment80).
+        // Tolerate a mix of local and remote children (b/152496153#comment80).
         entirelyRemote &= childData.getValue().isRemote();
       }