Fix minor spelling mistakes

sq/sq.c

@@ -205,7 +205,7 @@ int getargs(HSQUIRRELVM v,int argc, char* argv[],SQInteger *retval)
 
                 }
             }
-            //if this point is reached an error occured
+            //if this point is reached an error occurred
             {
                 const SQChar *err;
                 sq_getlasterror(v);