move RTI Connext DDS installation doc under Install-Connext-Universit…

[fujitatomoya]

trafficstars

…y-Eval.

closes https://github.com/ros2/ros2_documentation/issues/3573

[fujitatomoya]

@clalancette @ahcorde what do you think about this?

[github-actions[bot]]

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[fujitatomoya]

@ahcorde thanks for the review. let's hold this to merge for now, i would like @clalancette 's review comment on this.

[fujitatomoya]

@clalancette can you take a look when you have time?

[fujitatomoya]

@clalancette @audrow what do you think about this doc structure change for RTI connext DDS?

[christophebedard]

Minor comment aside, I personally think this makes a lot of sense.

[fujitatomoya]

@christophebedard @ahcorde it should be good now! requesting another review on https://github.com/ros2/ros2_documentation/pull/4774/commits/4e08766173adb1e0bf49fca1e8ce780f93e838a3