Rust-docs missing, can’t install on FreeBSD12.1 in Rust 1.43.1

[StrayLittlePunk]

Rust-docs missing, can’t install on FreeBSD12.1 in Rust `1.43.1.
The error is as follows：

` ✘ ⚡ root@saraunix  ~  rustup update stable
info: syncing channel updates for 'stable-x86_64-unknown-freebsd'

stable-x86_64-unknown-freebsd unchanged - rustc 1.43.1 (8d69840 2020-05-04)

info: checking for self-updates
⚡ root@saraunix  ~  rustup component add rust-docs
error: toolchain 'stable-x86_64-unknown-freebsd' does not contain component 'rust-docs' for target 'x86_64-unknown-freebsd'`

Excuse me, can someone help me explain why this is happening？

[kinnison]

FreeBSD is a tier two platform. We cannot always guarantee the existence of all components for such platforms and in this instance the documentation has failed to be built for it. I'm going to move this to the rust-lang/rust repository as that is the one which is responsible for building the components that rustup installs.

[Mark-Simulacrum]

Yep, this is essentially because we don't have CI time to build docs for all of the platforms. See #69525 which I'm closing this in favor of -- I think that's the "canonical" issue even if that's not super clear based on it's content, and I think there was another one that I can't find right now...