Adds req for base encoding & points out cURL example

[Annamarie2019]

For issue #1007 :

To the argument: Adds the requirement for multibase encoding

To the cURL example: Adds a u before the argument and adds a comment that it's satisfying the argument requirement. @TMoMoreau brought this to my attention in PR #1065 , but I think we should summarize his beautifully word-smithed prose, bc we state it in full in the argument description.

[filecorgi]

• Image optimization came back clean!
• Vuepress build was successful!

[johnnymatthews]

This is a sensible suggestion! However, we don't actually make changes to this API documentation manually. This section of the docs docs.ipfs.io/reference/http/api is created automatically by the http-api-docs tool we have in this repo: https://github.com/ipfs/ipfs-docs/tree/main/tools/http-api-docs

The tool spins up an IPFS node, and then asks the node what it can do. The response from the node is output as markdown. So to update the content, we have to create a PR against https://github.com/ipfs/go-ipfs. Buuut, I'm not quite sure where to make the PR. We'll have to get @aschmahmann or @hsanjuan to point us in the right direction.

[Annamarie2019]

@johnnymatthews @TMoMoreau Note for future reference: When we create the PR, we should keep in mind that both PRs ( #1067 and #1065 ) address the same issue. I suggest how to coordinate them in #1067.

[hsanjuan]

This documentation is generated from https://github.com/ipfs/go-ipfs/blob/master/core/commands/pubsub.go