tesseract manpage doesn't document stdin/- input

[Karl-Philipp Richter]

It doesn't contain the string `stdin` at all, but the usage message (displayed after invoking `tesseract` without any arguments`) explains it and it seem to be implemented.

There's no info what `tesseracts` expects as EOF.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: tesseract-ocr 3.03.03-1
Uname: Linux 4.1.3-040103-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.17.2-0ubuntu1.1
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Aug 3 16:46:36 2015
InstallationDate: Installed on 2015-06-08 (56 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: tesseract
UpgradeStatus: Upgraded to vivid on 2015-06-09 (55 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Hans Joachim Desserud (hjd)]

The manpage in 20.04 talks a bit about stdin/stdout (http://manpages.ubuntu.com/manpages/focal/en/man1/tesseract.1.html), but not necessarily clear what should be used for EOF