Minor typos fixed

According to Cambrigde English Dictionary "web server" ==correct, "webserver" ==incorrect.

docs/patterns/favicon.rst

@@ -4,7 +4,7 @@ Adding a favicon
 A "favicon" is an icon used by browsers for tabs and bookmarks. This helps
 to distinguish your website and to give it a unique brand.
 
-A common question is how to add a favicon to a flask application. First, of
+A common question is how to add a favicon to a Flask application. First, of
 course, you need an icon. It should be 16 × 16 pixels and in the ICO file
 format. This is not a requirement but a de-facto standard supported by all
 relevant browsers. Put the icon in your static directory as