Gateway APIs docs. Updated commands

[stitenko]

Updated the Gateway MQTT API reference docs (src/content/_includes/docs/reference/gateway-api/) with corrected/expanded request examples.

attributes.mdx — Request Attribute Values:

• Documented the request payload as id, device, keys (array), client (boolean: true for client-side, false for shared), with tabbed JSON examples for each variant.
• Replaced the two-terminal mosquitto_sub + mosquitto_pub example with a single mosquitto_rr command per variant (Client/Shared tabs) — avoids the response being lost when a second connection from the same gateway device drops the subscriber's connection.

[Copilot]

Pull request overview

Updates the Gateway MQTT API reference include docs to standardize gateway access token placeholders and provide product-specific guidance (self-hosted vs ThingsBoard Cloud), plus improves the attribute request example flow to avoid MQTT connection churn.

Changes:

• Added ShowFor + Products gating to show different “replace host/token” instructions for CE/PE vs PAAS/PAAS_EU pages.
• Standardized command examples to use GATEWAY_DEVICE_ACCESS_TOKEN (and documented $THINGSBOARD_HOST for self-hosted rendering).
• Expanded the “Request Attribute Values” section with mosquitto_rr request/response examples and clarified payload shape.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/content/_includes/docs/reference/gateway-api/telemetry.mdx	Adds product-specific replacement notes for the telemetry publish command.
src/content/_includes/docs/reference/gateway-api/rpc.mdx	Adds product-specific replacement notes and updates RPC command token placeholder.
src/content/_includes/docs/reference/gateway-api/overview.mdx	Adds product-specific replacement notes and updates connect/disconnect command token placeholder.
src/content/_includes/docs/reference/gateway-api/claiming.mdx	Adds product-specific replacement notes and updates claiming command token placeholder.
src/content/_includes/docs/reference/gateway-api/attributes.mdx	Updates HostCode import, expands attribute request docs, switches examples to mosquitto_rr, and adds a note about missing values.

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