[Multiformats] Wordsmithing the proposed charter before official review

[Bumblefudge <[e-mail]>]

Dear Multiformats enthusiasts:After consulting with some maintainers and the tribally knowledgeable Designated Experts on today's multicodec table, I have proposed [a few tweaks to the charter][1]. These edits mostly just set the stage more explicitly for clearer and more explicit multibase and multihash specs, and a tidier order-of-operations for the future working group, such as breaking down the intended deliverables into individual RFCs and numbering them in chronological order. The only substantial change in scope is that the first order of business will be finalizing an IETF RFC for unsigned_varint, since having this be very explicitly specified will make all the other registries and specifications easier to codify. A few +1s here on the list or there on the PR would be appreciated, as would change-requests or timely shouts of "sacrilege! blasphemy!"Thank you,__bumblefudge / juan[1]: https://github.com/msporny/charter-ietf-multiformats/pull/1/files		----bumblefudgejanit
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