Bug#1072354: Manpage copied without updating title

Hi!

> APT-TRANSPORT-HTTP(1)                 APT                APT-TRANSPORT-HTTP(1)
>                   ^========================== "S" forgotten ===============^

The source code for the man page in 2.6.1 is here:
https://salsa.debian.org/apt-team/apt/-/blob/2.6.1/doc/apt-transport-https.1.xml?ref_type=tags
As you can see, the name of the component (apt-transport-https) is
present in a non-truncated form throughout document.

The name of the component, seen in a header of man page, is taken from
this tag in the document (line 20 of xml):
<refentrytitle>apt-transport-https</refentrytitle>

The source file is in DocBook format. The available reference suggests
that maximal length of a title (TH tag in roff markup language) is 20
chars:
  - https://cdn.docbook.org/release/xsl/snapshot/doc/manpages/man.th.title.max.length
  - /usr/share/xml/docbook/stylesheet/docbook-xsl/manpages/param.xsl -> man.th.title.max.length

Count of chars in "APT\-TRANSPORT\-HTTPS" (the escape chars are
necessary in roff document) is 21, which is truncated to 20 chars, and
the ending "S" letter is lost.

To sum up: this issue is a result of inevitable truncation, not a result
of a mistake during copying of files.

Kamil