doc: mark readline promise implementation as experimental

Refs: nodejs#37947 (comment)
aduh95 · Sep 24, 2021 · 90290d1 · 90290d1
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commit 90290d1
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diff --git a/doc/api/readline.md b/doc/api/readline.md
@@ -535,6 +535,8 @@ line prompts are included in the calculations.
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+> Stability: 1 - Experimental
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 ### Class: `readlinePromises.Interface`
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