[fitsbits] language-edited FITS Standard document 4.0

[William Pence]

The updated Version 4 of the FITS Standard document that was recently 
approved by the FITS oversight committees is now available on the FITS 
Support Office Web site at

   https://fits.gsfc.nasa.gov/fits_standard.html

The text in this updated version has been edited to provide more 
consistent style for such things as word capitalization, hyphenation, 
punctuation (particularly commas), small numbers in letters, and other 
similar typographical features.  A list of changes is given in Appendix 
H.4 of the document itself.

Note that these edits have not altered in any way the technical 
requirements for FITS format files that were previously defined in the 
2016 Version 4 FITS Standard document.

- Bill Pence