Fix typo in horizontal pod autoscale documentation

[cfarrend]

Description

Change "behaviour" to "behavior" to match U.S English

https://kubernetes.io/docs/contribute/style/style-guide/#language

[linux-foundation-easycla]

• ✅login: cfarrend / name: Christopher Farrenden / (9176666)

The committers listed above are authorized under a signed CLA.

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[Arhell]

lgtm

[lmktfy]

Sure.

This change is a little like a trivial edit.
I'm happy to merge it, but please take that policy into account when you're making future contributions.

/lgtm
/approve

Thanks for the fix.

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: cf5c6ba766f12d017ac769237202602a10f96067

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lmktfy

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[cfarrend]

@lmktfy Sorry 😭 I will try and be more thorough next time