Update docs/io/ascii/write.rst
Update docs/io/ascii/write.rst

Co-authored-by: Tom Aldcroft <828568294c42bba1e6aaba03091b03d85160ad3c@gmail.com>
lpsinger/astropy,astropy/astropy,pllim/astropy,StuartLittlefair/astropy,saimn/astropy,StuartLittlefair/astropy,saimn/astropy,astropy/astropy,mhvk/astropy,saimn/astropy,lpsinger/astropy,larrybradley/astropy,StuartLittlefair/astropy,astropy/astropy,pllim/astropy,astropy/astropy,mhvk/astropy,larrybradley/astropy,StuartLittlefair/astropy,pllim/astropy,lpsinger/astropy,larrybradley/astropy,lpsinger/astropy,mhvk/astropy,astropy/astropy,saimn/astropy,pllim/astropy,lpsinger/astropy,saimn/astropy,larrybradley/astropy,mhvk/astropy,larrybradley/astropy,pllim/astropy,mhvk/astropy,StuartLittlefair/astropy