Merge branch '2.8' into 3.4

* 2.8:
  typo fix in speaker mentoring
  Added link to bcrypt (Wikipedia)
  Added a caution note about the checkMX option
  clarify the datetime format option

Author: javiereguiluz

contributing/community/speaker-mentoring.rst

@@ -33,7 +33,7 @@ public speaker. They can even do practice runs via video chat!
 Furthermore, they can also be an ally when it comes to the day of
 giving the talk at a conference!
 
-A great resource with advice on everything related to`public speaking`_
+A great resource with advice on everything related to `public speaking`_
 is a collection of links maintained by VM (Vicky) Brasseur. It covers
 everything from finding a conference call for proposals, how to
 refine a proposal, to how to put together slide decks to practical

doctrine/registration_form.rst

@@ -87,7 +87,7 @@ With some validation added, your class may look something like this::
          * @ORM\Column(type="string", length=64)
          */
         private $password;
-        
+
         /**
          * @ORM\Column(type="array")
          */
@@ -146,7 +146,7 @@ With some validation added, your class may look something like this::
             // You *may* need a real salt if you choose a different encoder.
             return null;
         }
-        
+
         public function getRoles()
         {
             return $this->roles;
@@ -318,7 +318,7 @@ encoder in the security configuration:
             ),
         ));
 
-In this case the recommended ``bcrypt`` algorithm is used. If needed, check out
+In this case the recommended `bcrypt`_ algorithm is used. If needed, check out
 the :ref:`user password encoding <security-encoding-user-password>` article.
 
 .. note::
@@ -455,3 +455,4 @@ us to add validation, even though there is no ``termsAccepted`` property on ``Us
 
 .. _`CVE-2013-5750`: https://symfony.com/blog/cve-2013-5750-security-issue-in-fosuserbundle-login-form
 .. _`FOSUserBundle`: https://github.com/FriendsOfSymfony/FOSUserBundle
+.. _`bcrypt`: https://en.wikipedia.org/wiki/Bcrypt

reference/constraints/Email.rst

@@ -117,6 +117,11 @@ checkMX
 If true, then the :phpfunction:`checkdnsrr` PHP function will be used to
 check the validity of the MX record of the host of the given email.
 
+.. caution::
+
+    This option is not reliable because it depends on the network conditions
+    and some valid servers refuse to respond to those requests.
+
 checkHost
 ~~~~~~~~~
 

reference/forms/types/datetime.rst

@@ -107,10 +107,10 @@ format
 
 If the ``widget`` option is set to ``single_text``, this option specifies
 the format of the input, i.e. how Symfony will interpret the given input
-as a datetime string. It defaults to the `RFC 3339`_ format which is used
-by the HTML5 ``datetime`` field. Keeping the default value will cause the
-field to be rendered as an ``input`` field with ``type="datetime"``. For
-more information on valid formats, see `Date/Time Format Syntax`_.
+as a datetime string. It defaults to the `datetime local`_ format which is
+used by the HTML5 ``datetime-local`` field. Keeping the default value will
+cause the field to be rendered as an ``input`` field with ``type="datetime-local"``.
+For more information on valid formats, see `Date/Time Format Syntax`_.
 
 .. include:: /reference/forms/types/options/hours.rst.inc
 
@@ -214,5 +214,5 @@ Field Variables
 |          |            | contains the input type to use (``datetime``, ``date`` or ``time``). |
 +----------+------------+----------------------------------------------------------------------+
 
-.. _`RFC 3339`: https://tools.ietf.org/html/rfc3339
+.. _`datetime local`: http://w3c.github.io/html-reference/datatypes.html#form.data.datetime-local
 .. _`Date/Time Format Syntax`: http://userguide.icu-project.org/formatparse/datetime#TOC-Date-Time-Format-Syntax