bootloader spec tweaks to be closer to stk-500

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diff --git a/docs/source/arduino/doublecast.rst b/docs/source/arduino/doublecast.rst
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+.. highlight:: cpp
+
+.. _arduino-doublecast:
+
+double() (cast)
+===============
+
+Description
+-----------
+
+Converts a value to the :ref:`double <arduino-double>` floating point
+data type.  Here is an example::
+
+   int x = 2;
+   double d = double(x);  // d now holds 2.0, a double value
+
+The value ``x`` can be of any type.  However, if ``x`` is not a number
+(like an ``int`` or ``long``), you will get strange results.
+
+See the :ref:`double <arduino-double>` reference for details about the
+precision and limitations of ``double`` values on the Maple.
+
+See Also
+--------
+
+-  :ref:`double <arduino-double>`
+-  :ref:`float <arduino-float>`
+-  :ref:`float() <arduino-floatcast>`
+
+.. include:: cc-attribution.txt