docs: add SHOW SECRETS and SHOW SUBSCRIPTIONS pages with schema-prefixed output

[Copilot]

Description

Documents behavior change from risingwavelabs/risingwave#23119 where SHOW commands now return schema-qualified names (e.g., public.table_name instead of table_name) to disambiguate objects across schemas in the search path.

Updated 8 existing command documentation files:

• SHOW TABLES - Updated example output from t1 to public.t1
• SHOW INTERNAL TABLES - Updated all example outputs with schema prefix
• SHOW VIEWS - Updated example from v3 to public.v3
• SHOW MATERIALIZED VIEWS - Added Notes section
• SHOW SOURCES - Updated example outputs with schema prefix
• SHOW SINKS - Added Notes section
• SHOW CONNECTIONS - Updated example from connection_name to public.connection_name
• SHOW FUNCTIONS - Updated all function names with public. prefix

Created 2 new documentation pages:

• SHOW SECRETS - New page documenting the command with schema-prefixed output examples
• SHOW SUBSCRIPTIONS - New page documenting the command with schema-prefixed output and retention_seconds column

Each file includes a Notes section explaining the schema prefix behavior. Both new pages were added to docs.json navigation and sql/commands/overview.mdx in alphabetical order.

Related code PR

risingwavelabs/risingwave#23119

Related doc issue

Closes the documentation tracking issue for PR #23119.

Checklist

• I have run the documentation build locally to verify the updates are applied correctly.
• For new pages, I have updated mint.json to include the page in the table of contents.
• All links and references have been checked and are not broken.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Document: feat(frontend): include schema name in output of SHOW [TABLE|..]S</issue_title>
<issue_description>This issue tracks the documentation update needed for the merged PR risingwavelabs/risingwave-docs#23119.

Source PR URL: risingwavelabs/risingwave#23119
Source PR Merged At: 2025-10-14T06:27:40Z

If it is a major improvement that deserves a new page or a new section in the documentation, please check if we should label it as an experiment feature.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Document: feat(frontend): include schema name in output of SHOW [TABLE|..]S #744

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[WanYixian]

@copilot SHOW SUBSCRIPTIONS and SHOW SECRETS lack dedicated documentation pages, add them and update them to reflect the schema-prefixed output changes

[Copilot]

@copilot SHOW SUBSCRIPTIONS and SHOW SECRETS lack dedicated documentation pages, add them and update them to reflect the schema-prefixed output changes

Created both documentation pages with schema-prefixed output examples in commit 614b7db. Both pages have been added to docs.json and overview.mdx in alphabetical order.