Describe the issue:

Under the section '5.2.1.1. Upgrade Requirements for Red Hat Gluster Storage 3.5', subpoint 4, a link to read more on LVM is provided. This redirects to a rhel7 specific page. As the whole section explains upgrade to 3.5, it would be better to add a RHEL 8 specific link.
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Suggestions for improvement:

Add a RHEL 8 specific link => [https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/configuring_and_managing_logical_volumes/logical_volumes-configuring-and-managing-logical-volumes#lvm_overview_overview-of-lvm] 

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Document URL:
https://access.redhat.com/documentation/en-us/red_hat_gluster_storage/3.5/html/installation_guide/sect-in-service_software_upgrade_from_red_hat_storage_3.4_to_red_hat_storage_3.5

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Chapter/Section Number and Title:
5.2.1. Pre-upgrade Tasks
  => 5.2.1.1. Upgrade Requirements for Red Hat Gluster Storage 3.5 
      => Sub point 3

Product Version: 3.5