Fix ServiceLevelObjective.get_all limit default in docstring

[taylor-chen]

What does this PR do?

Fix docstring to match the the default arg limit of 100

Description of the Change

Fix docstring to match the the default arg limit of 100

Alternate Designs

N/A

Possible Drawbacks

N/A

Verification Process

N/A

Additional Notes

Simple docstring change

Release Notes

N/A

Review checklist (to be filled by reviewers)

• Feature or bug fix MUST have appropriate tests (unit, integration, etc...)
• PR title must be written as a CHANGELOG entry (see why)
• Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• PR must have one changelog/ label attached. If applicable it should have the backward-incompatible label attached.
• PR should not have do-not-merge/ label attached.
• If Applicable, issue must have kind/ and severity/ labels attached at least.

[zippolyte]

Thanks for the fix !