some spelling updates

Author: xabbuh

contributing/documentation/overview.rst

@@ -292,7 +292,7 @@ Why Do my Changes Take so Long to Be Reviewed and/or Merged?
 
 Please be patient. It can take up to several days before your pull request can
 be fully reviewed. After merging the changes, it could take again several hours
-before your changes appear on the ``symfony.com`` website.
+before your changes appear on the Symfony website.
 
 Why Should I Use the Oldest Maintained Branch Instead of the Master Branch?
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

create_framework/introduction.rst

@@ -62,7 +62,7 @@ Before You Start
 Reading about how to create a framework is not enough. You will have to follow
 along and actually type all the examples included in this tutorial. For that,
 you need a recent version of PHP (5.5.9 or later is good enough), a web server
-(like Apache, NGINX or PHP's built-in web server), a good knowledge of PHP and
+(like Apache, nginx or PHP's built-in web server), a good knowledge of PHP and
 an understanding of Object Oriented programming.
 
 Ready to go? Read on!

setup/built_in_web_server.rst

@@ -7,7 +7,7 @@ How to Use PHP's built-in Web Server
 The PHP CLI SAPI comes with a `built-in web server`_. It can be used to run your
 PHP applications locally during development, for testing or for application
 demonstrations. This way, you don't have to bother configuring a full-featured
-web server such as :doc:`Apache or Nginx </setup/web_server_configuration>`.
+web server such as :doc:`Apache or nginx </setup/web_server_configuration>`.
 
 .. tip::