Some documentation links broken

[Michael Davidson]

For example, on https://github.com/east-winds/geodata/blob/master/doc/general/tableofcontents.md, links point to:
https://github.com/east-winds/geodata/blob/master/doc/Introduction.md
not the correct link:
https://github.com/east-winds/geodata/blob/master/doc/general/Introduction.md