Documentation -- Users Guide has some incorrect links

[gsjaardema]

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In the users guide at https://docs.unidata.ucar.edu/nug/current/index.html:

• The link for Appendix A points to https://docs.unidata.ucar.edu/netcdf-c/current.4-pre/attribute_conventions.html
• The link for Appendix B points to https://docs.unidata.ucar.edu/netcdf-c/current.4-pre/file_format_specifications.html

These are the links in the sidebar at the left of the page.

[edwardhartnett]

The NetCDF Users Guide is no longer with the netcdf-c library, but has it's own repo on Unidata's GitHub, called "NetCDF".