Fix BulkWrite::update() "multi" option usage in docs

Fixes #229

Author: jmikola

docs/bulk.md

@@ -55,24 +55,25 @@ $jonpall_id = $bulk->insert($jonpall);
  *  #1 (array|object): search criteria to select the document(s) for updating
  *  #2 (array|object): replacement document or atomic operations to apply
  *  #3 (array): update options
- *    * limit (integer): Updates all matching documents when 0 (false).
- *      Otherwise, only the first matching document is updated.
+ *    * multi (boolean): Updates all matching documents when true; otherwise,
+ *      only the first matching document is updated. Defaults to false.
  *    * upsert (boolean): If there is no matching document, create a new
- *      document from $filter and $update. */
+ *      document from the first two arguments. Defaults to false.
+ */
 $bulk->update(
     ["_id" => $hayley_id],
     ['$set' => ["citizen" => "Iceland"]],
-    ["limit" => 1, "upsert" => false]
+    ["multi" => false, "upsert" => false]
 );
 $bulk->update(
     ["citizen" => "Iceland"],
     ['$set' => ["viking" => true]],
-    ["limit" => 0, "upsert" => false]
+    ["multi" => true, "upsert" => false]
 );
 $bulk->update(
     ["name" => "Chuck Norris"],
     ['$set' => ["viking" => false]],
-    ["limit" => 1, "upsert" => true]
+    ["multi" => false, "upsert" => true]
 ];
 
 ?>

docs/crud.md

@@ -94,19 +94,20 @@ try {
 
 // Specify the search criteria and update operations (or replacement document)
 $filter = ["hello" => "world"];
-$update = ['$set' => ["hello" => "wonderful world"]];
+$newObj = ['$set' => ["hello" => "wonderful world"]];
 
 /* Specify some command options for the update:
  *
- *  * limit (integer): Updates all matching documents when 0 (false). Otherwise,
- *    only the first matching document is updated.
+ *  * multi (boolean): Updates all matching documents when true; otherwise, only
+ *    the first matching document is updated. Defaults to false.
  *  * upsert (boolean): If there is no matching document, create a new document
- *    from $filter and $update. */
-$options = ["limit" => 1, "upsert" => false];
+ *    from $filter and $newObj. Defaults to false.
+ */
+$options = ["multi" => true, "upsert" => false];
 
 // Create a bulk write object and add our update operation
 $bulk = new MongoDB\Driver\BulkWrite;
-$bulk->update($filter, $update, $options);
+$bulk->update($filter, $newObj, $options);
 
 try {
     /* Specify the full namespace as the first argument, followed by the bulk