BF:Docs: replace incorrect dashes with spaces in command names

[loj]

The documentation for the commands contain dashes that should be spaces, ie:

datalad-bids2scidata should be datalad bids2scidata

This applies a fix that was made for other docs (datalad/datalad#1761).

(Closes #89)

[jsheunis]

This looks like an easy merge. Anyone else want to comment? @yarikoptic @bpoldrack?

Regarding the appveyor build failure, the urllib.error.HTTPError: HTTP Error 404: Not Found error during download of datalad_installer (datalad_installer Downloading http://ftp.us.debian.org/debian/pool/main/g/git-annex/git-annex_8.20201127-1_amd64.deb) occurs in #88 as well. Is this expected? Should it be a separate issue?

[mslw]

The build failure happened 8 months ago. From what I can see, the appveyor configuration has been updated since in d0a3097 to use a newer version of git-annex (reflecting datalad core), so there's a chance the test would just complete if run now.

There might, however, be new problems with testing, in light of #91

[mslw]

I triggered a re re-run of the tests. With past and recent updates to appveyor config, the tests failure is out of the way.