Clean up some doc block typos

src/Collection.php

@@ -648,7 +648,7 @@ class Collection
      * @see UpdateMany::__construct() for supported options
      * @see http://docs.mongodb.org/manual/reference/command/update/
      * @param array|object $filter  Query by which to filter documents
-     * @param array|object $replacement Update to apply to the matched documents
+     * @param array|object $update  Update to apply to the matched documents
      * @param array        $options Command options
      * @return UpdateResult
      */
@@ -670,7 +670,7 @@ class Collection
      * @see ReplaceOne::__construct() for supported options
      * @see http://docs.mongodb.org/manual/reference/command/update/
      * @param array|object $filter  Query by which to filter documents
-     * @param array|object $replacement Update to apply to the matched document
+     * @param array|object $update  Update to apply to the matched document
      * @param array        $options Command options
      * @return UpdateResult
      */

src/Operation/CreateIndexes.php

@@ -108,7 +108,6 @@ class CreateIndexes implements Executable
      * "system.indexes" collection (MongoDB <2.6).
      *
      * @param Server $server
-     * @param IndexInput[] $indexes
      */
     private function executeLegacy(Server $server)
     {

src/Operation/DropDatabase.php

@@ -21,7 +21,6 @@ class DropDatabase implements Executable
      * Constructs a dropDatabase command.
      *
      * @param string $databaseName Database name
-     * @param string $collectionName Collection name
      */
     public function __construct($databaseName)
     {