docs, now with style

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+.. highlight:: cpp
+
+.. _lang-sq:
+
+sq()
+====
+
+(Macro) computes the square of a number.
+
+Syntax
+------
+
+::
+
+    sq(a)
+
+Parameters
+----------
+
+**a**: the number.
+
+Returns
+-------
+
+**a** squared (**a** × **a**).
+
+Warning
+-------
+
+Because of the way ``sq()`` is implemented, avoid using other
+functions or causing side effects inside the parentheses, as it may
+lead to incorrect results::
+
+    b = sq(a++);   // avoid this - yields incorrect results
+
+    b = sq(a);     // use this instead -
+    a++;           // keep other operations outside sq()
+
+
+Arduino Compatibility
+---------------------
+
+Maple's implementation of ``sq()`` is compatible with Arduino.
+
+
+.. include:: cc-attribution.txt