Revise tutorial articles

docs/tutorial/indexes.txt

@@ -4,12 +4,11 @@ Indexes
 
 .. default-domain:: mongodb
 
-Indexes support the efficient execution of queries in MongoDB. Without
-indexes, MongoDB must perform a *collection scan*, i.e. scan every
-document in a collection, to select those documents that match the
-query statement. If an appropriate index exists for a query,
-MongoDB can use the index to limit the number of documents it must
-inspect.
+Indexes support the efficient execution of queries in MongoDB. Without indexes,
+MongoDB must perform a *collection scan*, i.e. scan every document in a
+collection, to select those documents that match the query statement. If an
+appropriate index exists for a query, MongoDB can use the index to limit the
+number of documents it must inspect.
 
 The PHP driver supports managing indexes through the
 :phpclass:`MongoDB\\Collection` class, which implements MongoDB's
@@ -17,22 +16,22 @@ cross-driver `Index Management
 <https://github.com/mongodb/specifications/blob/master/source/index-management.rst>`_
 and `Enumerating Indexes
 <https://github.com/mongodb/specifications/blob/master/source/enumerate-indexes.rst>`_
-specifications. 
+specifications.
 
-This document provides an introduction to creating, listing, and
-dropping indexes using the |php-library|. The MongoDB Manual's
-:manual:`Indexes Section </indexes>` provides more thorough
-information about indexing in MongoDB.
+This document provides an introduction to creating, listing, and dropping
+indexes using the |php-library|. The MongoDB Manual's :manual:`Indexes
+</indexes>` reference provides more thorough information about indexing in
+MongoDB.
 
 Create Indexes
 --------------
 
-Create indexes with the :phpmethod:`MongoDB\\Collection::createIndex`
-and :phpmethod:`MongoDB\\Collection::createIndexes` methods. Refer to
-the method reference for more details about each method.
+Create indexes with the :phpmethod:`MongoDB\\Collection::createIndex()` or
+:phpmethod:`MongoDB\\Collection::createIndexes()` methods. Refer to the method
+reference for more details about each method.
 
-The following example creates an ascending index on the ``state`` field
-using the :phpmethod:`createIndex` method:
+The following example creates an ascending index on the ``state`` field using
+the :phpmethod:`createIndex() <MongoDB\\Collection::createIndex>` method:
 
 .. code-block:: php
 
@@ -44,24 +43,23 @@ using the :phpmethod:`createIndex` method:
 
    var_dump($result);
 
-When you create an index, the method returns its name, which is
-automatically generated from its specification. The above example would
-output something similar to::
+When you create an index, the method returns its name, which is automatically
+generated from its specification. The above example would output something
+similar to::
 
    string(7) "state_1"
 
 List Indexes
 ------------
 
-The :phpmethod:`MongoDB\\Collection::listIndexes` method provides
-information about the indexes in a collection.
-:phpmethod:`MongoDB\\Collection::listIndexes` method returns an
-iterator of ``MongoDB\Model\IndexInfo`` objects, which you can use to
-view information about each index. Refer to the method reference for
-more details about each method.
+The :phpmethod:`MongoDB\\Collection::listIndexes()` method provides information
+about the indexes in a collection. The
+:phpmethod:`MongoDB\\Collection::listIndexes()` method returns an iterator of
+:phpclass:`MongoDB\\Model\\IndexInfo` objects, which you can use to view
+information about each index. Refer to the method reference for more details.
 
-The following example lists all indexes in the ``zips`` collection in
-the ``demo`` database:
+The following example lists all indexes in the ``zips`` collection in the
+``demo`` database:
 
 .. code-block:: php
 
@@ -70,7 +68,7 @@ the ``demo`` database:
    $collection = (new MongoDB\Client)->demo->zips;
 
    foreach ($collection->listIndexes() as $indexInfo) {
-      var_dump($indexInfo);
+       var_dump($indexInfo);
    }
 
 The output would resemble::
@@ -105,9 +103,10 @@ The output would resemble::
 Drop Indexes
 ------------
 
-The :phpmethod:`MongoDB\\Collection::dropIndex` lets you drop a single index while 
-:phpmethod:`MongoDB\\Collection::dropIndexes` drops all of the indexes on a collection.
-Refer to the method reference for more details about each method.
+The :phpmethod:`MongoDB\\Collection::dropIndex()` method lets you drop a single
+index while :phpmethod:`MongoDB\\Collection::dropIndexes()` drops all of the
+indexes on a collection. Refer to the method reference for more details about
+each method.
 
 The following example drops a single index by its name, ``state_1``: