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