[Bug-gsl] Update documentation on matrix and vector "free" functions

[Lowell Johnson]

Hi,

In GSL 1.12, the gsl_matrix_free(), gsl_vector_free(), and gsl_block_free() 
functions were modified to accept NULL arguments (bug #25319, revision 4556).  
The associated documentation (doc/vectors.texi) has not been updated to 
reflect these changes.  For example, the documentation for gsl_vector_free() 
(Section 8.3.1, Vector allocation) says,

  "The vector v must be a valid vector object (a null pointer is not
  allowed)."

Similar wording exists for gsl_matrix_free() and gsl_block_free().

I think these statements need to be removed.

Thanks.

-- 
Lowell Johnson, Software Developer
Stinger Ghaffarian Technologies (SGT, Inc.)
Contractor to the U.S. Geological Survey (USGS)
Earth Resources Observation and Science (EROS) Center
47914 252nd Street, Sioux Falls, South Dakota  57198
Phone: 605.594.6872, Email: address@hidden