Fix typos. Thanks @osaris!

Documentation/En/Index.xyl

@@ -17,14 +17,14 @@
 
  <h2 id="Introduction" for="main-toc">Introduction</h2>
 
- <p>The business logic is very different of the Computer logic. “<q>All the
+ <p>The business logic is very different from the Computer logic. “<q>All the
  customers that have reached 100€ in one time receive a voucher of 10% on the
  next purchase</q>”. This rule allows to access to certain parts of the program
  if <strong>valids</strong>. However, it can <strong>change</strong> at any
- moment. Most of time, in a team, it is not the role of the developer to
+ moment. Most of the time, in a team, it is not the role of the developer to
  implement this rule. It will probably come from a <strong>business rules
  repository</strong>, which have been written by other persons, either
- <strong>manually</strong> or thanks to a <strong>third program</strong>.
+ <strong>manually</strong> or thanks to a <strong>third-party program</strong>.
  This implies that the language used to express a rule is not the languge used
  to develop the program. An even more obvious example is the use of a rule to
  filter elements: An element is accepted if “<q>its group is <em>customer</em>
@@ -192,7 +192,7 @@ var_dump(
  </table>
 
  <p>Of course, these examples represent atomic parts of the grammar that we can
- combined. Thus:
+ combine. Thus:
  <code><em>userA</em>.allows(<em>groups</em>[<em>groupId</em>][<em>userB</em>])</code>
  is valid. Just like <code>f(<em>user</em>, <em>points</em> > 7 and
  <em>points</em> &amp;lt; 42)</code> which is also valid.</p>
@@ -518,7 +518,7 @@ var_dump(
 > > > token(identifier, points)
 > > > token(identifier, >)
 > > > token(integer, 30)</code></pre>
- <p>In order this tree to be exploitable easier, it will be transformed into an
+ <p>In order to be exploitable, this tree will be transformed into an
  <strong>object model</strong>. This transformation is ensured by the
  <code>Hoa\Ruler\Visitor\Interpreter</code> visitor. Thus, if we should apply
  it manually:</p>