- Corrected the exception message.

git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@149891 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/lucene/analysis/Token.java

@@ -122,7 +122,7 @@ public final class Token {
   public void setPositionIncrement(int positionIncrement) {
     if (positionIncrement < 0)
       throw new IllegalArgumentException
-        ("Increment must be positive: " + positionIncrement);
+        ("Increment must be zero or greater: " + positionIncrement);
     this.positionIncrement = positionIncrement;
   }