Decompiling C++: Add static object initialization

documentation/decompilingcpp.md

@@ -117,7 +117,13 @@ its lifetime (e.g. it goes out of scope), which can lead to inclusion in
 exception handling code or just being called at the end of a code block even if
 the source code doesn't invoke it explicitly.  This automatic resource
 management is often called part of C++'s RAII (resource acquisition is
-initialization) design.
+initialization) design.  Lastly, objects with constructors that exist for the
+lifetime of the program (e.g. global variables or static local variables) have
+special treatment, having their constructor run before `main()` and their
+destructor run on program exit.  In an Xbox game specifically, the `_cinit()`
+function called by `mainXapiStartup()` walks a list of function pointers, with
+each called function calling an object's constructor and registering its
+destructor with `atexit()`.
 
 Virtual methods are methods that can be overridden on child classes.  They're
 not called directly, but instead called through a hidden first member that