Update documentation

[insidieux]

Description

Fix shell command in user-guide documentation
Add some notes to plugins documentation

Fixes #8

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• This change requires a documentation update

Checklist

• This PR contains documentation

[codecov-io]

Codecov Report

Merging #9 (5b66ae3) into master (a8335f9) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master        #9   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           13        13           
  Lines          260       260           
=========================================
  Hits           260       260           

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