Document `object_attributes.oldrev` in the merge request webhook event

What does this MR do and why?

Adds to the documentation to describe when is the object_attributes.oldrev field available.

This field is not always present in the webhook body so it's good to know when it will appear.

Screenshots or screen recordings

None

How to set up and validate locally

This is just a documentation change so it should be enough to read the changed text.

MR acceptance checklist

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added Community contribution workflowin dev labels

assigned to @spotlesstofu

@gitlab-bot ready

added workflowready for review label and removed workflowin dev label

Hi @kpaizee! Please review this documentation merge request.

added documentation twtriaged labels

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requested review from @justin_ho

added 1st contribution label

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requested review from @.luke and removed review request for @justin_ho

approved this merge request

Thank you @spotlesstofu for this contribution!

I'll assign this to our Technical Writer for a review!

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requested review from @kpaizee and removed review request for @.luke

changed milestone to %15.2

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	1 Message
	This merge request adds or changes documentation files. A review from the Technical Writing team before you merge is recommended. Reviews can happen after you merge.

Documentation review

The following files require a review from a technical writer:

• doc/user/project/integrations/webhook_events.md

The review does not need to block merging this merge request. See the:

• Metadata for the *.md files that you've changed. The first few lines of each *.md file identify the stage and group most closely associated with your docs change.
• The Technical Writer assigned for that stage and group.
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mentioned in issue gitlab-org/quality/triage-reports#8151 (closed)

added Technical Writing docsimprovement twdoing typemaintenance labels and removed twtriaged label

added 1 commit

• 6e49c4d2 - Apply GitLab documentation style

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approved this merge request

resolved all threads

enabled an automatic merge when the pipeline for 3a5a5774 succeeds

merged

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mentioned in commit 0170277d

added workflowstaging-canary label and removed workflowready for review label

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