call parent constructor in SDT and FormField

docs/styles.rst

@@ -45,6 +45,7 @@ Available Font style options:
 - ``color``. Font color, e.g. *FF0000*.
 - ``doubleStrikethrough``. Double strikethrough, *true* or *false*.
 - ``fgColor``. Font highlight color, e.g. *yellow*, *green*, *blue*.
+   See ``\PhpOffice\PhpWord\Style\Font::FGCOLOR_...`` constants for more values
 - ``hint``. Font content type, *default*, *eastAsia*, or *cs*.
 - ``italic``. Italic, *true* or *false*.
 - ``name``. Font name, e.g. *Arial*.
@@ -54,7 +55,8 @@ Available Font style options:
 - ``strikethrough``. Strikethrough, *true* or *false*.
 - ``subScript``. Subscript, *true* or *false*.
 - ``superScript``. Superscript, *true* or *false*.
-- ``underline``. Underline, *dash*, *dotted*, etc.
+- ``underline``. Underline, *single*, *dash*, *dotted*, etc.
+   See ``\PhpOffice\PhpWord\Style\Font::UNDERLINE_...`` constants for more values
 - ``lang``. Language, either a language code like *en-US*, *fr-BE*, etc. or an object (or as an array) if you need to set eastAsian or bidirectional languages
    See ``\PhpOffice\PhpWord\Style\Language`` class for some language codes.
 

src/PhpWord/Element/FormField.php

@@ -73,6 +73,7 @@ class FormField extends Text
      */
     public function __construct($type, $fontStyle = null, $paragraphStyle = null)
     {
+        parent::__construct(null, $fontStyle, $paragraphStyle);
         $this->setType($type);
     }
 

src/PhpWord/Element/SDT.php

@@ -68,6 +68,7 @@ class SDT extends Text
      */
     public function __construct($type, $fontStyle = null, $paragraphStyle = null)
     {
+        parent::__construct(null, $fontStyle, $paragraphStyle);
         $this->setType($type);
     }