[SPARK-23997][SQL][FOLLOWUP] Update exception message

## What changes were proposed in this pull request?

This PR is an follow-up PR of apache#21087 based on [a discussion thread](apache#21087 (comment)]. Since apache#21087 changed a condition of `if` statement, the message in an exception is not consistent of the current behavior.
This PR updates the exception message.

## How was this patch tested?

Existing UTs

Closes apache#22269 from kiszk/SPARK-23997-followup.

Authored-by: Kazuaki Ishizaki <[email protected]>
Signed-off-by: Sean Owen <[email protected]>

Author: kiszk

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/interface.scala

@@ -178,8 +178,8 @@ case class BucketSpec(
 
   if (numBuckets <= 0 || numBuckets > conf.bucketingMaxBuckets) {
     throw new AnalysisException(
-      s"Number of buckets should be greater than 0 but less than bucketing.maxBuckets " +
-        s"(`${conf.bucketingMaxBuckets}`). Got `$numBuckets`")
+      s"Number of buckets should be greater than 0 but less than or equal to " +
+        s"bucketing.maxBuckets (`${conf.bucketingMaxBuckets}`). Got `$numBuckets`")
   }
 
   override def toString: String = {