Adjustments Environment Lighting

[ValGrimm-U3D]

HDRP-479 added a help box to the Environment tab of the Lighting window in HDRP. I have added the text from that help box to the documentation, and updated the screenshot of the menu (which was missing the volumetric clouds option).

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Purpose of this PR

Why is this PR needed, what hard problem is it solving/fixing?
Updating the Environment Lighting page with the changes to the Environment tab of the Lighting Window in HDRP.

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Testing status

Describe what manual/automated tests were performed for this PR
Not applicable.

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Comments to reviewers

Notes for the reviewers you have assigned.
I added one sentence to the page which was approved in #6059, and updated the screenshot.

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[ValGrimm-U3D]

@JulienIgnace-Unity Hi Julien, It seems that the option Static Lighting Volumetric Clouds isn't documented in the manual. What shall I write there?

@adrien-de-tocqueville I'm use the info from Julien's to add a description of the new Static Lighting Volumetric Clouds option to the manual, along with the sentence about the effect of directional light which belongs in that description.

[adrien-de-tocqueville]

Yep, i restored the line you removed and improved the description of the option, i'll let julien review it

[ValGrimm-U3D]

Yep, i restored the line you removed and improved the description of the option, i'll let julien review it

I am a bit confused. I did not remove a line; I updated the illustration, changed a name of an option in error as I missed than an option is undocumented and added a line to it from Julien's PR because it looked like an option was undocumented. I'm going to go ahead and close this PR and confer with Julien about what to do about the new option. Thanks!

[adrien-de-tocqueville]

In the original version the line static lighting clouds was removed

But the option static lighting volumetric clouds is different although they have close names and it is indeed missing so the PR should be merged.
Addin @AnisB as he is responsible of volumetric clouds

[anisunity]

@ValGrimm-U3D Please include me in volumetric clouds related changes, thanks!