Fix annotation documentation about ALB attributes

[giannisbetas]

The documentation mentions that the MergeBehavior for the load-balancer-attributes annotation is Merge.
However, if the same attributes are defined across the ingresses of the same ingressGroup, they need to have the same values in order to be merged.

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[codecov-io]

Codecov Report

Merging #1722 (8b70ff2) into main (0297019) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1722   +/-   ##
=======================================
  Coverage   46.72%   46.72%           
=======================================
  Files         110      110           
  Lines        5984     5984           
=======================================
  Hits         2796     2796           
  Misses       2923     2923           
  Partials      265      265           

---

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[giannisbetas]

/retest

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@giannisbetas: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

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/retest

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[giannisbetas]

/assign @M00nF1sh

[M00nF1sh]

thanks for making this change.
/lgtm
/approve

just FYI, we'll add a new crd as IngressClass's parameter, where we can force customers using IngressGroup to set LB attributes there instead of on individual Ingresses in the future.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: giannisbetas, M00nF1sh
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