Update docs milestone description for alpha
What does this MR do and why?
alpha
deprecations were added in !84756 (merged) as a hackish way to denote an alpha field in GraphQL.
This change updates the generated docs to no longer say: "Deprecated in <milestone>"
for these kinds of deprecations.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #336383 (closed)