peer: Improve documentation.

[davecgh]

This fleshes out the doc.go documentation which is shown on godoc, the README.md shown on github, and improves a couple of comments for the fields in the Config struct.

[tuxcanfly]

Review status: 0 of 3 files reviewed at latest revision, 4 unresolved discussions, all commit checks successful.

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^{peer/doc.go, line 27 [r1] (raw file):}
typo: "responsible"

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^{peer/doc.go, line 47 [r1] (raw file):}
"the" repeated

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^{peer/README.md, line 32 [r1] (raw file):}
typo: "responsible"

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^{peer/README.md, line 52 [r1] (raw file):}
"the" repeated

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Comments from the review on Reviewable.io

[tuxcanfly]

Reviewed 3 of 3 files at r1.
Review status: all files reviewed at latest revision, 4 unresolved discussions, all commit checks successful.

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Comments from the review on Reviewable.io

[tuxcanfly]

OK, looks good.

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Reviewed 2 of 2 files at r2.
Review status: all files reviewed at latest revision, all discussions resolved, all commit checks successful.

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Comments from the review on Reviewable.io