docs: update LIO-SAM and vector map documentation

[ismetatabay]

Description

Pre-review checklist for the PR author

The PR author must check the checkboxes below when creating the PR.

• I've confirmed the contribution guidelines.
• The PR follows the pull request guidelines.

In-review checklist for the PR reviewers

The Reviewers must check the checkboxes below before approval.

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Post-review checklist for the PR author

The PR author must check the checkboxes below before merging.

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After all checkboxes are checked, anyone who has write access can merge the PR.

[github-actions]

Documentation URL: https://autowarefoundation.github.io/autoware-documentation/pr-465/
Modified URLs:

• https://autowarefoundation.github.io/autoware-documentation/pr-465/how-to-guides/integrating-autoware/creating-maps/converting-utm-to-mgrs-map/
• https://autowarefoundation.github.io/autoware-documentation/pr-465/how-to-guides/integrating-autoware/creating-maps/creating-vector-map/crosswalk/
• https://autowarefoundation.github.io/autoware-documentation/pr-465/how-to-guides/integrating-autoware/creating-maps/creating-vector-map/detection-area/
• https://autowarefoundation.github.io/autoware-documentation/pr-465/how-to-guides/integrating-autoware/creating-maps/creating-vector-map/
• https://autowarefoundation.github.io/autoware-documentation/pr-465/how-to-guides/integrating-autoware/creating-maps/creating-vector-map/lanelet2/
• https://autowarefoundation.github.io/autoware-documentation/pr-465/how-to-guides/integrating-autoware/creating-maps/creating-vector-map/speed-bump/
• https://autowarefoundation.github.io/autoware-documentation/pr-465/how-to-guides/integrating-autoware/creating-maps/creating-vector-map/stop-line/
• https://autowarefoundation.github.io/autoware-documentation/pr-465/how-to-guides/integrating-autoware/creating-maps/creating-vector-map/traffic-light/
• https://autowarefoundation.github.io/autoware-documentation/pr-465/how-to-guides/integrating-autoware/creating-maps/open-source-slam/lio-sam/
• https://autowarefoundation.github.io/autoware-documentation/pr-465/how-to-guides/integrating-autoware/creating-maps/pointcloud-map-downsampling/

[mitsudome-r]

Thanks for creating such a detailed instruction with nice videos. I've made some comments as initial review.