gmp 4.1 documentation improvement suggestions

[Serge Winitzki]

Thank you for the great work on the GMP library! This seems to be the 
best arbitrary-precision library out there.

I found two places in the gmp 4.1 documentation that I'd suggest 
to improve:

1) In the section "Floating-point operations/Converting floats" there is 
the following function prototype:

        double mpf_get_d_2exp (signed long int exp, mpf_t op)

It should be "signed long int* exp".

2) It may be not clear that when reading a float number through 
mpf_set_str from a string, not all digits in a string may be read, but 
only those that fit into the target precision of the mpf_t object. So 
the users should make sure that there are enough bits available there. 
This of course follows from the general rule "everything is done to 
target precision" but reading from a string is not an arithmetic 
operation and in any case I was confused by this and had to write a test 
program to figure this out.

Regards,

-- 
        Serge