lang-docs team adoptions charter follow-up

[jamesmunns]

@jackh726 raised a concern that was missed in the lang-docs team adopting rustlings, rust-by-example, and the book team:

So, I think moving these groups under lang-docs is good idea in terms of organization. But, what I personally would really like to see before this happens is some kind of "charter" from lang-docs on what what is expected from subteams in terms of autonomy and such. It may seem "obvious", but especially given @chris Krycho's comment re. the book team, I think it would be really good to formalize this.

I would like to follow up with this, which would mean:

• Revising the lang-docs charter, CC @ehuss @JohnTitor as team leads
• Adding a charter for rustlings, CC @mo8it, @shadows-withal as team leads
• Adding a charter for rust-by-example, CC @marioidival as team lead
• Adding a charter for the book, CC @carols10cents, @chriskrycho as team leads

I agree it is good to document:

• What the sub-teams are expected to do
• What responsibility is delegated to the sub-teams (particularly the expected level of autonomy).

Niko provided a potentially useful example of a charter from the proposed project-goals team: https://rust-lang.github.io/rust-project-goals/admin/team.html

[jamesmunns]

For reference, any of the members of the relevant teams are welcome to propose a charter, but I would expect review from the team leads and parent team leads. For the three adopted teams, this would need an r+ from the lang-docs leads as well as the adopted team leads. For the revisions to the lang-docs charter, that would mean an r+ from the lang-docs lead as well as the t-lang leads (CC @nikomatsakis @tmandry).

Leaving this as a note, mainly for @rust-lang/team-repo-admins when they review the follow-on PRs adding charter content here.

[jamesmunns]

Whoops, I was under the impression that charters (or a link to them?) were encoded in the teams metadata, which is why I opened this issue here.

They definitely aren't, so I need to re-home this issue. I'll find a suitable place for it, as I'd like to make sure it doesn't get lost! Sorry for the noise for the teams repo admins :)

[tmandry]

A link to them probably should be. I would like it if there was a central place to view team charters even, but I'm not sure where it would go (possibly forge?)

[jamesmunns]

It would be cool to either inline them in https://www.rust-lang.org/governance (generated from this repo), or at least show a link button.

I've opened #1651 to track that, so we don't get off topic here.