fixed trivial spelling issues in javadoc

git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@894224 13f79535-47bb-0310-9956-ffa450edef68

contrib/benchmark/src/java/org/apache/lucene/benchmark/byTask/tasks/PerfTask.java

@@ -287,7 +287,7 @@ public abstract class PerfTask implements Cloneable {
 
   /**
    * Sub classes that supports parameters must override this method to return true.
-   * @return true iff this task supports command line params.
+   * @return true if this task supports command line params.
    */
   public boolean supportsParams () {
     return false;

contrib/highlighter/src/java/org/apache/lucene/search/highlight/WeightedSpanTerm.java

@@ -53,8 +53,8 @@ public class WeightedSpanTerm extends WeightedTerm{
    * Checks to see if this term is valid at <code>position</code>.
    *
    * @param position
-   *            to check against valid term postions
-   * @return true iff this term is a hit at this position
+   *            to check against valid term positions
+   * @return true if this term is a hit at this position
    */
   public boolean checkPosition(int position) {
     // There would probably be a slight speed improvement if PositionSpans

contrib/instantiated/src/java/org/apache/lucene/store/instantiated/InstantiatedTermPositions.java

@@ -80,7 +80,7 @@ public class InstantiatedTermPositions
 
   /**
    * Skips entries to the first beyond the current whose document number is
-   * greater than or equal to <currentTermPositionIndex>target</currentTermPositionIndex>. <p>Returns true iff there is such
+   * greater than or equal to <currentTermPositionIndex>target</currentTermPositionIndex>. <p>Returns true if there is such
    * an entry.  <p>Behaves as if written: <pre>
    *   boolean skipTo(int target) {
    *     do {