alpn-policy accept only string and not alpn-policy

[BouchaaraAdil]

Issue

fix typo documentation service.beta.kubernetes.io/aws-load-balancer-alpn-policy

Description

we tended to use the annotation as a list to accept different policies and map them to listeners,
but while applying we got an error that it accepts only one value of
[HTTP1Only, HTTP2Only, HTTP2Optional, HTTP2Preferred, None]

it would be nice if we have an annotation which accepts different alpn policies and not only one
something like
service.beta.kubernetes.io/aws-load-balancer-alpn-policies with type StringMap so then we assign port to each alpn policy

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[M00nF1sh]

thanks for fixing this 😄
will update the doc shortly.