Docs: Fix --rm=false flag in container_run.md

[juliogarciape]

- What I did

Corrected the usage of the --rm=false flag in the container_run.md documentation example. See Docker Container Run - Clean up for reference.

- How I did it

Removed the incorrect --rm=false flag from the example and updated it to use the --rm flag to comply with the example text: Automatically remove the container when it exits. Also for the --rm=true flag it is not necessary to specify true, as that is the default behavior.

- How to verify it

1. Run the command docker run --rm alpine echo "Hello World" in a Docker environment to confirm that the container is automatically removed after execution.
2. Run the command docker run --rm=false alpine echo "Hello World" in a Docker environment to confirm that the container is not automatically removed after execution.
3. All available Docker documentation and CLI help indicate that the --rm flag is used to remove a container when it exits. There is an error in the example of container run when it states that setting --rm=false will remove a container when it exits.

- Description for the changelog

docs/cli/container_run: Fix example usage of `--rm=false` flag to `--rm` in container_run.md

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

[laurazard]

LGTM

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.75%. Comparing base (a18c896) to head (605c9bf).
Report is 16 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5435   +/-   ##
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  Coverage   59.75%   59.75%           
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  Files         345      345           
  Lines       23428    23428           
=======================================
  Hits        13999    13999           
  Misses       8455     8455           
  Partials      974      974           

[thaJeztah]

LGTM, thanks!