fix the wording in versionadded directives

Author: xabbuh

components/debug/introduction.rst

@@ -8,8 +8,8 @@ The Debug Component
     The Debug component provides tools to ease debugging PHP code.
 
 .. versionadded:: 2.3
-    The Debug component is new to Symfony 2.3. Previously, the classes were
-    located in the HttpKernel component.
+    The Debug component was introduced in Symfony 2.3. Previously, the classes
+    were located in the HttpKernel component.
 
 Installation
 ------------

components/process.rst

@@ -219,7 +219,8 @@ Process Idle Timeout
 --------------------
 
 .. versionadded:: 2.4
-   The :method:`Symfony\\Component\\Process\\Process::setIdleTimeout` method was added in Symfony 2.4.
+   The :method:`Symfony\\Component\\Process\\Process::setIdleTimeout` method
+   was introduced in Symfony 2.4.
 
 In contrast to the timeout of the previous paragraph, the idle timeout only
 considers the time since the last output was produced by the process::