Fix whitespace

Author: JoshRosen

sql/core/src/main/scala/org/apache/spark/sql/execution/SparkStrategies.scala

@@ -74,7 +74,7 @@ private[sql] abstract class SparkStrategies extends QueryPlanner[SparkPlan] {
    * [[org.apache.spark.sql.SQLConf.AUTO_BROADCASTJOIN_THRESHOLD]], the planner would mark it as the
    * ''build'' relation and mark the other relation as the ''stream'' side.  The build table will be
    * ''broadcasted'' to all of the executors involved in the join, as a
-   * [[org.apache.spark.broadcast.Broadcast]] object.  If both   estimates exceed the threshold, they
+   * [[org.apache.spark.broadcast.Broadcast]] object.  If both estimates exceed the threshold, they
    * will instead be used to decide the build side in a [[joins.ShuffledHashJoin]].
    */
   object HashJoin extends Strategy with PredicateHelper {