make nextLink and nextPageParameters internal

Author: idickerson7

sdk/search/azure-search-documents/src/main/java/com/azure/search/documents/models/SearchDocumentsResult.java

@@ -141,7 +141,7 @@ public List<QueryAnswerResult> getAnswers() {
      * @return the nextPageParameters value.
      */
     @Generated
-    public SearchRequest getNextPageParameters() {
+    SearchRequest getNextPageParameters() {
         return this.nextPageParameters;
     }
 
@@ -163,7 +163,7 @@ public List<SearchResult> getResults() {
      * @return the nextLink value.
      */
     @Generated
-    public String getNextLink() {
+    String getNextLink() {
         return this.nextLink;
     }