Fixed doc typos re: @Jsonb(De)Serializer

[mkarg]

Partial fix of #70 (JavaDocs only)

Unfortunately I could only fix the JavaDocs, as there is just boilerplate for the actual spec.

[mkarg]

I marked this PR as a draft, as the spec source is not contained. Please tell me if I shall keep it in draft state until the spec source is available, or whether I shall turn it in a real PR so you could merge it. Thanks. :-)

[aguibert]

hi @mkarg thanks for the PR! I agree it would be good to update the spec doc at the same time as the javadoc so we don't lose track and the spec and javadoc become inconsistent with each other.

@m0mus do we have an ETA on when the real spec doc will be available on this repo?

[m0mus]

@aguibert You better ask Eclipse folks. They need to do some legal checks before allowing us using the old spec text.

[mkarg]

@m0mus Did EF already ask you for your approval of the spec? I was asked weeks ago and it seems nothing happend so far.

So how to proceed? Keep the PR in draft state until we have the OK from the EF, or merge this PR, keep the issue open, and create another PR for the spec change?

[m0mus]

@mkarg No, I didn't have any request from EF regarding the spec. I suppose that it will happen after Jakarta EE 8 release.

[jungm]

Spec document has been merged a long time ago (3b879d7), can we get this PR merged or possibly even extended to also fix the spec?