Remove the following [remove un-used attributes from document-attributes.adoc:

Confirmed No Usage (0 instances found)

{rhbk-first}

  — No instances found

{rhbk-short}

  — No instances found

{IDEPluginFilename}

  — No instances found

{CodeReadyStudioDownloadPageURL}

  — No instances found

{ocp-first}

  — No instances found

{ocp-version}

  — No instances found

{ocp-supported}

  — No instances found

{op-system-base-full}

  — No instances found

{op-system-base}

— No instances found

{EclipseCrsGuideTitle}

— No instances found

{MavenBookName}

— No instances found

{IntelliJBookName}

— No instances found

{rh-ocp-local}

— No instances found

{MavenProductVersion}

— No instances found

{ProductDocWebConsoleGuideURL}

— No instances found

{EclipseCrsGuideURL}

— No instances found

{IntelliJGuideURL}

— No instances found

{ProductDocUserInterfaceGuideURL}

— No instances found

{ProductDocMavenGuideURL}

— No instances found

{ProductDocVscGuideURL}

— No instances found

{ProductDocIntelliJGuideURL}

— No instances found

{OpenShiftDocsURL}

— No instances found

{JiraMTRURL}

— No instances found

{reports}

— No instances found

Please double-check by doing a search for instances before deleting and merging your PR