minor #9825 Fix a typo in the HTML5 date form property (Calinou)

This PR was submitted for the 2.7 branch but it was merged into the 2.8 branch instead (closes #9825).

Discussion
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Fix a typo in the HTML5 date form property

This changes "datapicker" to "datepicker".

Commits
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da51bc4 Fix a typo in the HTML5 date form property

Author: javiereguiluz

reference/forms/types/options/html5.rst.inc

@@ -6,5 +6,5 @@ html5
 If this is set to ``true`` (the default), it'll use the HTML5 type (date, time
 or datetime) to render the field. When set to ``false``, it'll use the text type.
 
-This is useful when you want to use a custom JavaScript datapicker, which
+This is useful when you want to use a custom JavaScript datepicker, which
 often requires a text type instead of an HTML5 type.