doc: interpret-trailers: join new-trailers again

There are three paragraphs that talk about how a new trailer is added.
But the first one is separated from the other two by two paragraphs
about how `key-alias` can make using `--trailer` more convenient. This
short how-to does not follow thematically from the previous paragraph,
and can wait until we have fully described how a new trailer is
added. So let’s move the three paragraphs about the new-trailer topic
together and move the how-to paragraphs after that.

***

Let’s now review the history of the document. Even if the document
is not quite correct in its current state, just doing the apparently
obvious edit without considering the history does not respect the
effort that went into changing the document in the past.

These three paragraphs were originally next to each other, in the first
version of the doc.[1] But extra sentences about this how-to topic was
added to the first paragraph nine years later:[2]

    [...]
    `': '` (one colon followed by one space). For convenience, the
    <token> can be a shortened string key (e.g., "sign") instead of the
    full string which should [...]

And then it was split into it’s own paragraph a little later.[3]

This evolution shows, in my opinion, that this how-to never followed
thematically from the existing topic. Which means that there is nothing
that was potentially lost to time that we need to restore or respect.

† 1: dfd66ddf (Documentation: add documentation for 'git
     interpret-trailers', 2014-10-13)
† 2: eda2c44c (doc: trailer: mention 'key' in DESCRIPTION, 2023-06-15)
† 3: 6ccbc667 (trailer doc: <token> is a <key> or <keyAlias>, not both,
     2023-09-07)

Suggested-by: D. Ben Knoble <ben.knoble+github@gmail.com>
Signed-off-by: Kristoffer Haugsbakk <code@khaugsbakk.name>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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