Fix minor mistakes in the bandwidth-file dir-spec entry
atagar pointed out the following errors in the bandwidth-file dir-spec entry: The bandwidth-file line appears: ``` [At most once for votes; does not occur in consensuses.] ``` He also suggested that we could change the name to bandwidth-file-headers or bandwidth-headers if we want. I don't mind what we call it, but it has to match legacy/trac#3723. I also noticed that the definition of Value is wrong, it should be: ``` Value ::= ArgumentCharValue+ ArgumentCharValue ::= any printing ASCII character except NL and SP. ``` We should also add the new file_created and latest_bandwidth header keywords from bandwidth-file-spec. Edit: file_created and latest_bandwidth were added in legacy/trac#26155 and it has been merged 3 now to master Edit: previous line is about adding them to dir-spec
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