Port RabbitMQ URL placeholder description and custom builders/formatters doc to 4.3.0

[ChaninduImanjith]

Purpose

Resolves #1884

Goals

Port the RabbitMQ URL placeholder description and custom builders/formatters documentation updates from PR #1870 to the 4.3.0 branch.

Approach

1. Added the placeholder parameter row to the RabbitMQ transport parameters table in the sending messages section.
2. Added a new "Configuring custom builders/formatters in blocking mode" section to the message builders and formatters documentation.

User stories

As a WSO2 MI developer, I want to understand the RabbitMQ URL placeholder parameter and how to configure custom message builders/formatters in blocking mode so that I can properly configure my integration.

Release note

Documentation updated to include the RabbitMQ URL placeholder parameter description and custom builders/formatters configuration for blocking mode transport.

Documentation

• en/docs/install-and-setup/setup/message-builders-formatters/message-builders-and-formatters.md
• en/docs/reference/synapse-properties/transport-parameters/rabbitmq-transport-parameters.md

Training

N/A

Certification

N/A - Documentation-only update.

Marketing

N/A

Automation tests

N/A - No code changes introduced.

Security checks

• Followed secure coding standards? Yes
• Ran FindSecurityBugs plugin? N/A
• No keys, passwords, or secrets committed? Yes

Samples

N/A

Related PRs

#1870, #1884

Migrations

N/A

Test environment

Tested on Fedora OS (local documentation verification).

Learning

N/A

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[Copilot]

Pull request overview

Ports documentation updates to the 4.3.0 branch to clarify (1) the RabbitMQ send-URI placeholder behavior and (2) how to configure custom message builders/formatters when running in blocking mode.

Changes:

• Added a placeholder row to the RabbitMQ transport send parameters table.
• Added a new section describing blocking.custom_message_builders / blocking.custom_message_formatters TOML configuration for blocking mode.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
en/docs/reference/synapse-properties/transport-parameters/rabbitmq-transport-parameters.md	Documents the RabbitMQ send-URI placeholder parameter behavior.
en/docs/install-and-setup/setup/message-builders-formatters/message-builders-and-formatters.md	Adds blocking-mode configuration guidance for custom message builders/formatters.

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[ChaninduImanjith]

Ported the RabbitMQ address URL format changes from baed986 to this branch as well. @SanojPunchihewa