minor symfony#10850 Remove minor bugs from docs. (Heaven31415)

This PR was submitted for the master branch but it was squashed and merged into the 4.1 branch instead (closes symfony#10850).

Discussion
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Remove minor bugs from docs.

Hey, I was reading your docs some time ago, really liked them. I have found some minor bugs and thought it would be a good idea to fix them.

Commits
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ff55efd Remove minor bugs from docs.

controller.rst

@@ -148,7 +148,7 @@ and ``redirect()`` methods::
         // redirect to a route with parameters
         return $this->redirectToRoute('app_lucky_number', array('max' => 10));
 
-        // redirects to a route and mantains the original query string parameters
+        // redirects to a route and maintains the original query string parameters
         return $this->redirectToRoute('blog_show', $request->query->all());
 
         // redirects externally

introduction/from_flat_php_to_symfony2.rst

@@ -181,7 +181,7 @@ of the application are isolated in a new file called ``model.php``::
     in this example, only a portion (or none) of the model is actually concerned
     with accessing a database.
 
-The controller (``index.php``) is now is just a few lines of code::
+The controller (``index.php``) is now just a few lines of code::
 
     // index.php
     require_once 'model.php';
@@ -262,7 +262,7 @@ an individual blog result based on a given id::
     {
         $connection = open_database_connection();
 
-        $query = 'SELECT created_at, title, body FROM post WHERE  id=:id';
+        $query = 'SELECT created_at, title, body FROM post WHERE id=:id';
         $statement = $connection->prepare($query);
         $statement->bindValue(':id', $id, PDO::PARAM_INT);
         $statement->execute();
@@ -533,7 +533,7 @@ a simple application. Along the way, you've made a simple routing
 system and a method using ``ob_start()`` and ``ob_get_clean()`` to render
 templates. If, for some reason, you needed to continue building this "framework"
 from scratch, you could at least use Symfony's standalone
-:doc:`Routing </components/routing>` and component and :doc:`Twig </templating>`,
+:doc:`Routing </components/routing>` component and :doc:`Twig </templating>`,
 which already solve these problems.
 
 Instead of re-solving common problems, you can let Symfony take care of

templating.rst

@@ -125,7 +125,7 @@ Throughout this article, template examples will be shown in both Twig and PHP.
     Twig can also do things that PHP can't, such as whitespace control,
     sandboxing, automatic HTML escaping, manual contextual output escaping,
     and the inclusion of custom functions and filters that only affect templates.
-    Twig contains little features that make writing templates easier and more concise.
+    Twig contains a lot of features that make writing templates easier and more concise.
     Take the following example, which combines a loop with a logical ``if``
     statement: