clarify & correct Replicator target schema requirements

[taroface]

DOC-15257

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Files changed:

• src/current/_includes/molt/fetch-data-load-output.md
• src/current/_includes/molt/fetch-schema-table-filtering.md
• src/current/_includes/molt/fetch-table-filter-userscript.md
• src/current/_includes/molt/migration-create-sql-user.md
• src/current/_includes/molt/migration-prepare-database.md
• src/current/_includes/molt/migration-prepare-schema.md
• src/current/_includes/molt/migration-schema-design-practices.md
• src/current/_includes/molt/migration-stop-replication.md
• src/current/_includes/molt/molt-connection-strings.md
• src/current/_includes/molt/molt-docker.md
• src/current/_includes/molt/molt-drop-constraints-indexes.md
• src/current/_includes/molt/molt-install.md
• src/current/_includes/molt/molt-secure-connection-strings.md
• src/current/_includes/molt/molt-setup.md
• src/current/_includes/molt/molt-troubleshooting-failback.md
• src/current/_includes/molt/molt-troubleshooting-fetch.md
• src/current/_includes/molt/molt-troubleshooting-replication.md
• src/current/_includes/molt/optimize-replicator-performance.md
• src/current/_includes/molt/replicator-flags-usage.md
• src/current/_includes/molt/replicator-flags.md
• src/current/_includes/molt/replicator-metrics.md
• src/current/_includes/molt/verify-output.md
• src/current/_includes/v25.4/sidebar-data/migrate.json
• src/current/molt/migrate-bulk-load.md
• src/current/molt/migrate-failback.md
• src/current/molt/migrate-load-replicate.md
• src/current/molt/migrate-resume-replication.md
• src/current/molt/molt-fetch.md
• src/current/molt/molt-replicator.md
• src/current/molt/molt-verify.md
• src/current/molt/replicator-flags.md
• src/current/releases/molt.md

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