FUI-2126: entity-management new params

[ArturKrasinski]

A minor update to the entity-management documentation (new parameters related to CRUD buttons have been added).

Please do not merge until this PR: LINK has been merged.

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Thank you for contributing to the documentation.

Do the changes you have made apply to both Current and Previous versions?
No - current only

Have you checked all new or changed links?
Yes, there are no changes.

Is there anything else you would like us to know?
No

For reference:

• We have an internal contributions guide
• We have a style guide

This week's exciting excerpts from the style guide

• We write in UK English, with Oxford English Dictionary (OED) spellings, grammar and vocabulary.

Use the present tense wherever possible. Only use another tense where it is strictly necessary.

• Present tense (preferred whenever possible): The script creates a new folder.
• Future tense (avoid whenever possible): The script will create a new folder.