cleaning up previous commits.

note that addition of new files under docs/source/lang/api and
docs/source/lang/cpp which were just copies of files in
docs/source/lang/ imply that change history is lost to git.

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diff --git a/docs/source/lang/compoundarithmetic.rst b/docs/source/lang/compoundarithmetic.rst
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-.. highlight:: cpp
-
-.. _lang-compoundarithmetic:
-
-Compound Arithmetic Operators (``+=`` , ``-=``, ``*=``, ``/=``)
-===============================================================
-
-These oparators perform a mathematical operation on a variable with
-another constant or variable.  These operators are just a convenient
-shorthand::
-
-    x += y;   // equivalent to the expression x = x + y;
-    x -= y;   // equivalent to the expression x = x - y;
-    x *= y;   // equivalent to the expression x = x * y;
-    x /= y;   // equivalent to the expression x = x / y;
-
-Here is an example::
-
-    int x = 2;
-    int y = 10;
-
-    x += 4;          // x now contains 6
-    x -= 3;          // x now contains 3
-    x *= y;          // x now contains 30
-    x /= 2;          // x now contains 15
-    x += max(20, 6); // x now contains 35
-    x -= sq(5);      // x now contains 15
-
-Parameters
-----------
-
-**x**: a numeric variable
-
-**y**: a numeric variable, number constant, or any other expression
-that evaluates to a number (e.g. call to a function that returns a
-number).
-
-See Also
---------
-
-- :ref:`Arithmetic operators <lang-arithmetic>`
-
-
-.. include:: cc-attribution.txt