remove docs, they moved to a seperate repo log ago

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diff --git a/docs/reference/plugins/validation/tls-alpn/index.md b/docs/reference/plugins/validation/tls-alpn/index.md
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----
-sidebar: reference
----
-
-# TLS-ALPN validation
-TLS-ALPN validation works as follows:
-- For each domain (e.g. `sub.example.com`), the ACME server sends a 
-challenge consisting of an `x` and `y` value. The truth is actually a little 
-more complicated than that, but for the sake of this explanation it will suffice.
-- The client has to make sure that when the ACME server sets up a TLS connection 
-to `sub.example.com`, a specifically crafted negotiation response with a 
-self-signed certificate containing the `y` value as extension is presented.
-- The validation request is *always* made to port 443, that cannot be changed. 
-- There may be more than one validation connection for the same token, e.g. 
-for different IP addresses (in case of multiple A/AAAA records).
-- Let's Encrypt does **not** disclose the source locations of these requests, which 
-effectively means that the domain has to be accessible for the public, 
-at least for the duration of the validation.
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