Add detailed descriptions for --ulimit options in docker run documentation

[MHM98]

- What I did
Add available options for --ulimit flag in docker run command
- How I did it
According to units.go file in docker/go-units repository, i updated the documentation

- 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 ✅

Project coverage is 59.30%. Comparing base (77a8a8c) to head (9c941ba).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5855   +/-   ##
=======================================
  Coverage   59.30%   59.30%           
=======================================
  Files         353      353           
  Lines       29694    29694           
=======================================
  Hits        17609    17609           
  Misses      11104    11104           
  Partials      981      981