Fix build warnings v/5.5

[fantkolja]

3:58:25 PM: [12:58:25.163] WARN (asciidoctor): skipping reference to missing attribute: mc_home
3:58:25 PM:     file: docs/modules/deploy-manage/pages/h2-upgrade.adoc
3:58:25 PM:     source: https://github.com/hazelcast/management-center-docs (branch: v/5.5 | start path: docs)
3:58:25 PM: [12:58:25.163] WARN (asciidoctor): skipping reference to missing attribute: mc_home
3:58:25 PM:     file: docs/modules/deploy-manage/pages/h2-upgrade.adoc
3:58:25 PM:     source: https://github.com/hazelcast/management-center-docs (branch: v/5.5 | start path: docs)
3:58:25 PM: [12:58:25.163] WARN (asciidoctor): skipping reference to missing attribute: timestamp
3:58:25 PM:     file: docs/modules/deploy-manage/pages/h2-upgrade.adoc
3:58:25 PM:     source: https://github.com/hazelcast/management-center-docs (branch: v/5.5 | start path: docs)
3:58:25 PM: [12:58:25.658] WARN (asciidoctor): id assigned to anchor already in use: hazelcast-mc-ldap-ssl-truststorepassword
3:58:25 PM:     file: docs/modules/deploy-manage/pages/system-properties.adoc:684
3:58:25 PM:     source: https://github.com/hazelcast/management-center-docs (branch: v/5.5 | start path: docs)

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