[FLINK-24373][docs] Remove BETA Tag from FLIP-27 Source Docs

[sjwiesman]

What is the purpose of the change

Remove BETA Tag from FLIP-27 Source Docs. We will backport this to 1.14 release branch.

Does this pull request potentially affect one of the following parts:

Not Relevant

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)

[sjwiesman]

cc @fapaul

@wuchong or @leonardBang I feel pretty confident I deleted the relevant section from the translated page but would either of you mind double checking 😅

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[leonardBang]

Thanks @sjwiesman for the contribution, looks good to me both English and Chinese parts.

[fapaul]

Thanks for fixing @sjwiesman can you also backport this change to 1.14?

[sjwiesman]

@fapaul yes sir

Thank you both for the review! Merging into 1.14 and master