docs: clarify hostname annotation behavior

[PseudoResonance]

What does it do ?

Explicitly states that by default, the hostname annotation will NOT override the automatically detected hostnames. Instead, the two lists are merged together, unless the ingress-hostname-source annotation is used to adjust this behavior.

Motivation

I spent some time messing around before realizing that ingress-hostname-source existed as I thought hostname would override.

More

• Yes, this PR title follows Conventional Commits
• Yes, I added unit tests
• Yes, I updated end user documentation accordingly

[k8s-ci-robot]

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[ivankatliarchuk]

/ok-to-test
/lgtm

[coveralls]

Pull Request Test Coverage Report for Build 18625620077

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.005%) to 78.586%

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Totals
Change from base Build 18457751024:	0.005%
Covered Lines:	15846
Relevant Lines:	20164

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💛 - Coveralls