[llvm] [Docs] Update Maintainer in Developer Policy (PR #154687)

[Aaron Ballman via llvm-commits]

================
@@ -141,57 +141,79 @@ products.
 Maintainers are those volunteers; they are regular contributors who volunteer
 to take on additional community responsibilities beyond code contributions.
 Community members can find active and inactive maintainers for a project in the
-``Maintainers.rst`` file at the root directory of the individual project.
-
-Maintainers are volunteering to take on the following shared responsibilities
-within an area of a project:
-
-* ensure that commits receive high-quality review, either by the maintainer
-  or by someone else,
-* help to confirm and comment on issues,
-* mediate code review disagreements through collaboration with other
-  maintainers (and other reviewers) to come to a consensus on how best to
-  proceed with disputed changes,
-* actively engage with relevant RFCs,
-* aid release managers with backporting and other release-related
-  activities,
-* be a point of contact for contributors who need help (answering questions
-  on Discord/Discourse or holding office hours).
+``Maintainers.md`` file at the root directory of the individual project.
----------------
AaronBallman wrote:

Not every project uses `.md` files, for example Clang uses `.rst` so we can have the maintainers documented more publicly: https://github.com/llvm/llvm-project/blob/main/clang/Maintainers.rst?plain=1 (which generates https://clang.llvm.org/docs/Maintainers.html)

Same concern applies elsewhere. I don't think we're intending these changes to require reworking .rst to .md?

https://github.com/llvm/llvm-project/pull/154687