Update docs to clarify how to add content

[yakky]

Description

Describe:

Clarify how text content works by linking django CMS editor tutorial

References

Fix #363

Checklist

• [x] I have read the contribution guide
• [x] Code lint checked via inv lint
• [x] changes file included (see docs)
• [x] Usage documentation added in case of new features

[codecov[bot]]

Codecov Report

Merging #641 into develop will not change coverage. The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #641   +/-   ##
========================================
  Coverage    94.50%   94.50%           
========================================
  Files           22       22           
  Lines         1111     1111           
  Branches       138      138           
========================================
  Hits          1050     1050           
  Misses          23       23           
  Partials        38       38           

Flag	Coverage Δ
unittests	94.50% <ø> (ø)

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[coveralls]

Coverage decreased (-0.1%) to 96.627% when pulling 576051fb6ce5815df47c0e67c75fc970080535d9 on docs/issue-363-content into 0e834417586137436e616cf90efe7a5642bf37f9 on develop.

[yakky]

Wrong branch name