docs(data): clarify entity dispatcher fires action once

[Nosfistis]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ngrx/platform/blob/main/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

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

What is the current behavior?

Closes #3979

What is the new behavior?

Mention that re-subscribing to an EntityCollectionService command
does not create a new action, even though some commands return
an Observable with the result.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

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[Nosfistis]

I applied the changes. Should I also squash the commits?

[brandonroberts]

I applied the changes. Should I also squash the commits?

You can, but you don't have to. We'll squash them on merge either way

[timdeschryver]

👍 thanks @Nosfistis