reflow: investigate line-break edge cases

[bobheadxi]

Observed problems, named by best guess at what might be causing the issue

• trailing punctuation reflow: investigate line-break edge cases #7 (comment) - fixed in 339f6ea etc
• acronyms reflow: investigate line-break edge cases #7 (comment)
• symbols reflow: investigate line-break edge cases #7 (comment) - only linebreaks on sentences

[bobheadxi]

trailing punctuation

want:

To convert yaml to Dhall we use a wrapper helper tool around the standard `yaml-to-dhall` command that knows how to build the COMKIR organizational tree (see [background.md](background.md#COMKIR) ).
The wrapper is a command line tool written in Go and available in this repo: `github.com/sourcegraph/ds-to-dhall`.

got:

To convert yaml to Dhall we use a wrapper helper tool around the standard `yaml-to-dhall` command that knows how to build the COMKIR organizational tree (see [background.md](background.md#COMKIR) ).
The wrapper is a command line tool written in Go and available in this repo: `github.com/sourcegraph/ds-to-dhall`
.

Possibly related to #1 - we need to look at the next "line" to see if we should join it or not

[bobheadxi]

acronyms

want:

3. Upload the repository to a specific "sourcegraph-$ LANGUAGE" organization (where $LANGUAGE is the primary language of the repository as identified by github.com),
   (e.x. the ["sourcegraph-go" organization](https://ghe.sgdev.org/sourcegraph-go) for <https://ghe.sgdev.org/sourcegraph-go/gorilla-mux>)

got:

3. Upload the repository to a specific "sourcegraph-$ LANGUAGE" organization (where  $LANGUAGE is the primary language of the repository as identified by github.com), (e.x.
   the ["sourcegraph-go" organization](https://ghe.sgdev.org/sourcegraph-go) for <https://ghe.sgdev.org/sourcegraph-go/gorilla-mux>)

[bobheadxi]

symbols

want:

1. Replace the `/` character in the repository's name with `-` (e.x. `gorilla/mux` -> `gorilla-mux`)

got:

1. Replace the `/` character in the repository's name with `-` (e.x. `gorilla/mux`
    \-> `gorilla-mux`)