Replaced y with ✓

[alf]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Replaces usage of y in the conversion table with ✓.

y is not a valid state according to the glossary.
It is hard to spot the difference between x and y, so fixing this will make it less likely that reads the wrong thing from the table.

If y does not mean ✓ then y should be added to the glossary.
Again, since these marks are hard to differentiate I hope this won't be necessary.

[linux-foundation-easycla]

• ❌ - login: @alf / name: Alf Lervåg . The commit (4e6a041) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please submit a support request ticket.

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[cdrage]

Good catch @alf

Sign the k8s CLA and I can merge this in! :)