Lots of fixes

Author: javiereguiluz

reference/constraints/Hostname.rst

@@ -1,9 +1,9 @@
 Hostname
 ========
 
-This constraint ensures that the given value is a valid and non-reserved
-host name (internally it uses the ``FILTER_VALIDATE_DOMAIN`` option of the
-:phpfunction:`filter_var` PHP function).
+This constraint ensures that the given value is a valid host name (internally it
+uses the ``FILTER_VALIDATE_DOMAIN`` option of the :phpfunction:`filter_var` PHP
+function).
 
 .. versionadded:: 5.1
 
@@ -29,7 +29,7 @@ will contain a host name.
 
     .. code-block:: php-annotations
 
-        // src/Entity/Server.php
+        // src/Entity/ServerSettings.php
         namespace App\Entity;
 
         use Symfony\Component\Validator\Constraints as Assert;
@@ -86,9 +86,9 @@ will contain a host name.
             }
         }
 
-The following TLD are reserved according to `RFC 2606`_ and that's why hostnames
-containing them are not considered valid: ``.example``, ``.invalid``, ``.localhost``,
-``.test``.
+The following top-level domains (TLD) are reserved according to `RFC 2606`_ and
+that's why hostnames containing them are not considered valid: ``.example``,
+``.invalid``, ``.localhost``, and ``.test``.
 
 .. include:: /reference/constraints/_empty-values-are-valid.rst.inc
 
@@ -120,16 +120,16 @@ Parameter        Description
 **type**: ``bool`` **default**: ``true``
 
 By default, hostnames are considered valid only when they are fully qualified
-and include the their TLDs (top-level domain names). For instance,
-``example.com`` is valid by ``example`` is not.
+and include their TLDs (top-level domain names). For instance, ``example.com``
+is valid but ``example`` is not.
 
 Set this option to ``false`` to not require any TLD in the hostnames.
 
 .. note::
 
     This constraint does not validate that the given TLD value is included in
     the `list of official top-level domains`_ (because that list is growing
-    continuously and it's nearly impossible to keep track of it).
+    continuously and it's hard to keep track of it).
 
 .. _`RFC 2606`: https://tools.ietf.org/html/rfc2606
-.. _`full list of official top-level domains`: https://en.wikipedia.org/wiki/List_of_Internet_top-level_domains
+.. _`list of official top-level domains`: https://en.wikipedia.org/wiki/List_of_Internet_top-level_domains