Revise bootstrap sequence redesign blog post to clarify no observable impact for distro packagers

[jieyouxu]

To clarify no observable impact are expected for distribution packagers, as this was reported to be confusing in #general > FYI: Bootstrap sequence redesign @ 💬.

Changes:

• Added a revision entry.
• Duplicated example on what a Rust toolchain can be built with (prior stable, prior stable point releases, same stable) in TL;DR section to make it more prominent.
• Added a FAQ entry to explicitly spell out that no observable changes should be experienced by distribution packagers.

r? @Mark-Simulacrum

Rendered

[eli-schwartz]

Thank you, this clarification looks like exactly what I was hoping for.