add Sld parameters in doc

[unetablettedechocolat]

Please check if the PR fulfills these requirements

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

What kind of change does this PR introduce? docs update

What is the current behavior? Sld parameters are not described in the docs

What is the new behavior (if this is a feature change)? Sld parameters are described in the docs

Does this PR introduce a breaking change or deprecate an API?

• [ ] Yes
• [x] No