nats-io / nats.go / 3261

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Spelling fixes, mostly comments

The new `gospel` tool, <https://github.com/kortschak/gospel>, uses hunspell
libraries but pre-registers as acceptable words every symbol from the Go
source, massively reducing the noise and making comment spell-checking a
tractable problem.  It recently gained support for a `.words` file located in
the same directory as the `go.mod` file, to define local words.  With this, we
can fix real issues too.

This PR reduces the complaints down to 4:
 1. A reference to `syncSubscribers` which I can't figure out
 2. A reference to a `pubArg`
 3. Two references to `splitArgs`.

I made two actual code changes:
 1. Fixing a **non-exported** const type for consistency with all the others:
    `apiStreamList` -> `apiStreamListT`.
 2. Changing an error message to refer to a field which exist

Lots of typo fixes; references to since-renamed fields; etc.

A reference to `PublishAsynMsg` might have been intended to be
`PublishAsyncMsg` but that doesn't exist either, so I removed it.
Similarly, `SubjectIsDelivery` lived briefly but a stale reference was left in
a comment, so I removed that.

To reproduce:

    go install github.com/kortschak/gospel@latest
    gospel .

8 of 8 new or added lines in 4 files covered. (100.0%)

6936 of 8133 relevant lines covered (85.28%)

13348.04 hits per line