fix typos in web.rst

docs/scenarios/web.rst

@@ -164,7 +164,7 @@ support for Python 2.7 applications.
 Heroku allows you to run as many Python web applications as you like, 24/7 and
 free of charge. Heroku is best described as a horizontal scaling platform. They
 start to charge you once you "scale" you application to run on more than one
-Dyno (abstacted servers) at a time.
+Dyno (abstracted servers) at a time.
 
 Heroku publishes `step-by-step instructions
 <http://devcenter.heroku.com/articles/python>`_ on how to set up your first
@@ -212,7 +212,7 @@ Templating
 Most WSGI applications are responding to HTTP requests to serve
 content in HTML or other markup languages. Instead of generating directly
 textual content from Python, the concept of separation of concerns
-advise us to use templates. A template engine manage a suite of
+advises us to use templates. A template engine manage a suite of
 template files, with a system of hierarchy and inclusion to
 avoid unnecessary repetition, and is in charge of rendering
 (generating) the actual content, filling the static content
@@ -220,10 +220,10 @@ of the templates with the dynamic content generated by the
 application.
 
 As template files are
-sometime written by designers or front-end developpers,
+sometimes written by designers or front-end developers,
 it can be difficult to handle increasing complexity.
 
-Some general good pratices apply to the part of the
+Some general good practices apply to the part of the
 application passing dynamic content to the template engine,
 and to the templates themselves.
 
@@ -233,7 +233,7 @@ and to the templates themselves.
   it is easier to add some missing variable when needed than to remove
   a likely unused variable later.
 
-- Many template engine allow for complex statements
+- Many template engines allow for complex statements
   or assignments in the template itself, and many
   allow some Python code to be evaluated in the
   templates. This convenience can lead to uncontrolled