Update to pipeline schema doc #1045

[jenmuell]

Update to pipeline schema doc based on nf-core/website#1045

I work on an update of the pipeline schema doc:

• 2 sections for adding parameters and updating parameters with the graphical interface
• 1 section about the nf-core schema docs command

PR checklist

• This comment contains a description of changes (with reason)
• CHANGELOG.md is updated
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

[github-actions]

This PR is against the master branch ❌

• Do not close this PR
• Click Edit and change the base to dev
• This CI test will remain failed until you push a new commit

---

Hi @jenmuell,

It looks like this pull-request is has been made against the jenmuell/tools master branch.
The master branch on nf-core repositories should always contain code from the latest release.
Because of this, PRs to master are only allowed if they come from the jenmuell/tools dev branch.

You do not need to close this PR, you can change the target branch to dev by clicking the "Edit" button at the top of this page.
Note that even after this, the test will continue to show as failing until you push a new commit.

Thanks again for your contribution!

[codecov]

Codecov Report

Merging #1926 (c342220) into dev (6bf8f30) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #1926   +/-   ##
=======================================
  Coverage   62.01%   62.01%           
=======================================
  Files          42       42           
  Lines        4862     4862           
=======================================
  Hits         3015     3015           
  Misses       1847     1847           

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[mirpedrol]

Thanks @jenmuell!
Only some small style suggestions :)

[mirpedrol]

@nf-core-bot fix linting