Fix sub-command description indentation in sphinx docs

[chmreid]

This PR fixes a problem with the sphinx docs that causes cli sub-command descriptions to be indented and be formatted as code blocks instead of normal text. Fixes an item in #443.

[codecov-io]

Codecov Report

Merging #479 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #479   +/-   ##
=======================================
  Coverage   85.35%   85.35%           
=======================================
  Files          41       41           
  Lines        1864     1864           
=======================================
  Hits         1591     1591           
  Misses        273      273

Impacted Files	Coverage Δ
hca/upload/cli/list_area_command.py	100% <ø> (ø)	⬆️
hca/upload/cli/creds_command.py	86.36% <ø> (ø)	⬆️
hca/upload/cli/upload_command.py	92.5% <ø> (ø)	⬆️
hca/upload/cli/list_file_status_command.py	100% <ø> (ø)	⬆️
hca/cli.py	63.39% <ø> (ø)	⬆️
hca/upload/cli/list_areas_command.py	100% <ø> (ø)	⬆️
hca/upload/cli/generate_status_report_command.py	100% <ø> (ø)	⬆️
hca/upload/cli/forget_command.py	100% <ø> (ø)	⬆️
hca/upload/cli/select_command.py	96.66% <ø> (ø)	⬆️

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[DailyDreaming]

LGTM.