Update documentation 4.0.0

[eromano]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x")

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation
• Other... Please describe:

What is the current behaviour? (You can also link to an open issue here)

Update documentation 4.0.0

What is the new behaviour?

Does this PR introduce a breaking change? (check one with "x")

• Yes
• No

If this PR contains a breaking change, please describe the impact and migration path for existing applications: ...

Other information:

[codecov-commenter]

Codecov Report

Merging #5968 into develop will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #5968      +/-   ##
===========================================
+ Coverage    76.36%   76.38%   +0.01%     
===========================================
  Files          845      845              
  Lines        18702    18722      +20     
  Branches      3692     3696       +4     
===========================================
+ Hits         14282    14300      +18     
  Misses        3305     3305              
- Partials      1115     1117       +2     

Impacted Files	Coverage Δ
...nts/content-metadata/content-metadata.component.ts	93.93% <ø> (ø)
...ib/document-list/services/document-list.service.ts	74.50% <ø> (ø)
...omponents/search-header/search-header.component.ts	79.03% <ø> (ø)
.../attach-file/attach-file-cloud-widget.component.ts	90.69% <0.00%> (-3.42%)	⬇️
...rvices-cloud/src/lib/form/mocks/cloud-form.mock.ts	100.00% <0.00%> (ø)
lib/core/form/services/form.service.ts	60.65% <0.00%> (+0.32%)	⬆️
...ud/src/lib/form/components/form-cloud.component.ts	84.74% <0.00%> (+0.34%)	⬆️
...lib/form/models/form-cloud-representation.model.ts	57.14% <0.00%> (+7.14%)	⬆️

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