minor #4388 Minor spelling fix (GeertDD)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #4388).

Discussion
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Minor spelling fix

http://www.oxforddictionaries.com/definition/english/ground

Commits
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ef3a58e Minor spelling fix

Author: weaverryan

book/forms.rst

@@ -6,7 +6,7 @@ Forms
 
 Dealing with HTML forms is one of the most common - and challenging - tasks for
 a web developer. Symfony integrates a Form component that makes dealing with
-forms easy. In this chapter, you'll build a complex form from the ground-up,
+forms easy. In this chapter, you'll build a complex form from the ground up,
 learning the most important features of the form library along the way.
 
 .. note::

book/http_fundamentals.rst

@@ -37,7 +37,7 @@ HTTP is the term used to describe this simple text-based language. And no
 matter how you develop on the web, the goal of your server is *always* to
 understand simple text requests, and return simple text responses.
 
-Symfony is built from the ground-up around that reality. Whether you realize
+Symfony is built from the ground up around that reality. Whether you realize
 it or not, HTTP is something you use everyday. With Symfony, you'll learn
 how to master it.