Document pure/const parameter attributes
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<dt><tt>nest</tt></dt>
<dd>This indicates that the parameter can be excised using the
<a href="#int_trampoline">trampoline intrinsics</a>.</dd>
+ <dt><tt>pure</tt></dt>
+ <dd>This function attribute indicates, that the function have no effects
+ except the return value and its return value depends only on the
+ arguments and/or global variables.</dd>
+ <dt><tt>const</tt></dt>
+ <dd>This function attribute is slightly more stricter version
+ of <tt>pure</tt> function attribute. <tt>const</tt> functions are not
+ allowed to read global memory, so such function only examines its arguments
+ and has no effects except return value.</dd>
</dl>
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