tds: Documentation structure

 
 C.3 Documentation structure
 ===========================
 
 We considered placing additional documentation files in the same
 directory as the source files for the packages, but we felt that users
 should be able to find documentation separately from sources, since most
 users have no interest in sources.
 
    We hope that a separate, but parallel, structure for documentation
 would (1) keep the documentation together and (2) make it as
 straightforward as possible for users to find the particular
 documentation they were after.