minor #14184 [Debug] Rework a bit the PHP doc (lyrixx)

This PR was submitted for the 2.7 branch but it was merged into the 2.6 branch instead (closes #14184).

Discussion
----------

[Debug] Rework a bit the PHP doc

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | ~
| License       | MIT
| Doc PR        | ~

Commits
-------

126514f [Debug] Rework a bit the PHP doc
9d0c0ae Added missing changelog entry

src/Symfony/Component/Debug/ErrorHandler.php

@@ -240,7 +240,7 @@ class ErrorHandler
     }
 
     /**
-     * Sets the error levels that are to be thrown.
+     * Sets the PHP error levels that should throw an exception when a PHP error occurs.
      *
      * @param int  $levels  A bit field of E_* constants for thrown errors
      * @param bool $replace Replace or amend the previous value
@@ -263,7 +263,7 @@ class ErrorHandler
     }
 
     /**
-     * Sets the error levels that are logged or thrown with their local scope.
+     * Sets the PHP error levels for which local variables are preserved.
      *
      * @param int  $levels  A bit field of E_* constants for scoped errors
      * @param bool $replace Replace or amend the previous value
@@ -282,7 +282,7 @@ class ErrorHandler
     }
 
     /**
-     * Sets the error levels that are logged with their stack trace.
+     * Sets the PHP error levels for which stack trace is preserved.
      *
      * @param int  $levels  A bit field of E_* constants for traced errors
      * @param bool $replace Replace or amend the previous value

src/Symfony/Component/VarDumper/CHANGELOG.md

@@ -0,0 +1,7 @@
+CHANGELOG
+=========
+
+2.7.0
+-----
+
+ * deprecated Cloner\Data::getLimitedClone(). Use withMaxDepth, withMaxItemsPerDepth or withRefHandles instead.