[20501] Improve LARGE_DATA documentation (backport #671)

[mergify]

This is an automatic backport of pull request #671 done by Mergify.
Cherry-pick of 2010219 has failed:

On branch mergify/bp/2.6.x/pr-671
Your branch is up to date with 'origin/2.6.x'.

You are currently cherry-picking commit 2010219.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   code/XMLTester.xml
	modified:   docs/fastdds/transport/tcp/tcp.rst
	modified:   docs/fastdds/troubleshooting/troubleshooting.rst
	modified:   docs/fastdds/use_cases/large_data/large_data.rst
	modified:   docs/fastdds/use_cases/tcp/tcp_with_multicast_discovery.rst

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   docs/fastdds/rtps_layer/rtps_layer.rst

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[mergify]

Cherry-pick of 2010219 has failed:

On branch mergify/bp/2.6.x/pr-671
Your branch is up to date with 'origin/2.6.x'.

You are currently cherry-picking commit 2010219.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   code/XMLTester.xml
	modified:   docs/fastdds/transport/tcp/tcp.rst
	modified:   docs/fastdds/troubleshooting/troubleshooting.rst
	modified:   docs/fastdds/use_cases/large_data/large_data.rst
	modified:   docs/fastdds/use_cases/tcp/tcp_with_multicast_discovery.rst

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   docs/fastdds/rtps_layer/rtps_layer.rst

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[cferreiragonz]

@richiprosima please test docs