minor #20249 [Form] Remove a broken link (javiereguiluz)

This PR was merged into the 5.4 branch.

Discussion
----------

[Form] Remove a broken link

Fixes #20248.

Commits
-------

5cbf3c0 [Form] Remove a broken link

Author: javiereguiluz

reference/forms/types/search.rst

@@ -4,8 +4,6 @@ SearchType Field
 This renders an ``<input type="search">`` field, which is a text box with
 special functionality supported by some browsers.
 
-Read about the input search field at `DiveIntoHTML5.info`_
-
 +---------------------------+----------------------------------------------------------------------+
 | Rendered as               | ``input search`` field                                               |
 +---------------------------+----------------------------------------------------------------------+
@@ -65,5 +63,3 @@ The default value is ``''`` (the empty string).
 .. include:: /reference/forms/types/options/row_attr.rst.inc
 
 .. include:: /reference/forms/types/options/trim.rst.inc
-
-.. _`DiveIntoHTML5.info`: http://diveintohtml5.info/forms.html#type-search