MINOR: log fix in SnapshottableCoordinator (#17726)

Reviewers: donaldzhu-cc, Chia-Ping Tsai <[email protected]>

Author: jeffkbkim

Diff for: coordinator-common/src/main/java/org/apache/kafka/coordinator/common/runtime/SnapshottableCoordinator.java

@@ -165,7 +165,7 @@ public synchronized void updateLastCommittedOffset(Long offset) {
 
         if (offset > lastWrittenOffset) {
             throw new IllegalStateException("New committed offset " + offset + " of " + tp +
-                "must be less than or equal to " + lastWrittenOffset + ".");
+                " must be less than or equal to " + lastWrittenOffset + ".");
         }
 
         lastCommittedOffset = offset;