fixed javadoc typo and added helpful diagnostic toString methods

git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@156599 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/lucene/search/BooleanClause.java

@@ -27,7 +27,13 @@ public class BooleanClause implements java.io.Serializable {
       // typesafe enum pattern, no public constructor
       super(name);
     }
-   
+
+    public String toString() {
+      if (this == MUST) return "+";
+      if (this == MUST_NOT) return "-";
+      return "";
+    }
+
     /** Use this operator for terms that <i>must</i> appear in the matching documents. */
     public static final Occur MUST = new Occur("MUST");
     /** Use this operator for terms of which <i>should</i> appear in the 
@@ -150,4 +156,8 @@ public class BooleanClause implements java.io.Serializable {
     return query.hashCode() ^ (this.required?1:0) ^ (this.prohibited?2:0);
   }
 
+
+  public String toString() {
+    return occur.toString() + query.toString();
+  }
 }

src/java/org/apache/lucene/search/BooleanQuery.java

@@ -72,7 +72,7 @@ public class BooleanQuery extends Query {
    *
    * {@link Similarity#coord(int,int)} may be disabled in scoring, as
    * appropriate. For example, this score factor does not make sense for most
-   * automatically generated queries, like {@link WildCardQuery} and {@link
+   * automatically generated queries, like {@link WildcardQuery} and {@link
    * FuzzyQuery}.
    *
    * @param disableCoord disables {@link Similarity#coord(int,int)} in scoring.