Doc update for admin views

[mschmo]

Description of changes:

• Adds description row for the missing admin views:

1. v_wlm_queue_state.sql
2. v_connection_summary.sql
3. v_find_dropuser_objs.sql
4. v_generate_cursor_query.sql
5. v_generate_external_tbl_ddl.sql
6. v_get_stored_proc_params.sql
7. v_query_type_duration_summary.sql
8. v_vacuum_summary.sql

• Fixes truncated purpose for v_generate_unload_copy_cmd.sql
• Cleans up spaces and inconsistencies

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.