Documentation fixes, handling i32 type correctly

Author: nijtmans

doc/bn.tex

@@ -918,7 +918,7 @@ \subsection{Long Long Constants - platform dependant}
 unsigned long long mp_get_magll (mp_int * a);
 \end{alltt}
 
-This will return the least significant bits of the mp\_int $a$ that fit into a ``long''.
+This will return the least significant bits of the mp\_int $a$ that fit into a ``long long''.
 
 \subsection{Initialize and Setting Constants}
 To both initialize and set small constants the following two functions are available.