doc/next: added release notes for goroutine leak profiles

[VladSaiocUber]

Described goroutine leak profiles in the
release notes, under the runtime section.

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[gopherbot]

Message from t hepudds:

Patch Set 1:

(1 comment)

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Message from t hepudds:

Patch Set 1:

(1 comment)

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Message from Michael Knyszek:

Patch Set 1:

(14 comments)

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[gopherbot]

This PR (HEAD: c1f793a) has been imported to Gerrit for code review.

Please visit Gerrit at https://go-review.googlesource.com/c/go/+/716400.

Important tips:

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[gopherbot]

Message from Georgian-Vlad Saioc:

Patch Set 1:

(14 comments)

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