man: reformat docker-run.1.md to prevent linting warnings

[thaJeztah]

• relates to https://github.com/docker/docker-ce-packaging/issues/1197

Before this patch, lintian would complain about some lines being too long:

lintian ./*.deb
...
W: docker-ce-cli: groff-message troff:<standard input>:642: warning [p 8, 10.2i, div '3tbd1,1', 0.0i]: cannot break line [usr/share/man/man1/docker-run.1.gz:1]

groff -t -man ./docker-run.1 > /dev/null
troff:./docker-run.1:602: warning [p 9, 2.8i]: cannot adjust line
troff:./docker-run.1:669: warning [p 10, 2.5i, div '3tbd1,1', 0.0i]: cannot break line

- What I did

- How I did it

- How to verify it

- Human readable description for the release notes

- A picture of a cute animal (not mandatory but encouraged)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 55.02%. Comparing base (af09051) to head (b77d57c).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6089   +/-   ##
=======================================
  Coverage   55.02%   55.02%           
=======================================
  Files         361      361           
  Lines       30131    30131           
=======================================
  Hits        16581    16581           
  Misses      12595    12595           
  Partials      955      955           

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[vvoland]

Probably needs a rerun?