[clue]

This changeset fixes the SSDP example, which has been failing with Class "Loop" not found ever since #21 (2021) updated the examples to use the default loop. It now uses the fully qualified React\EventLoop\Loop class like all other examples and links to clue/reactphp-ssdp, along with some minor cleanups in the examples and documentation. Examples and documentation only, the library itself is unchanged.

Builds on top of #21

[Copilot]

🟢 Approval recommended

The targeted class-reference fix resolves the example failure, and the remaining edits affect only documentation and whitespace.

No open issues 🎉

What changed in this PR

Fixes the SSDP example’s Class "Loop" not found error following the default-loop migration in #21. Library code is unchanged.

Changes:

• Uses the fully qualified React\EventLoop\Loop class in the SSDP example.
• Adds a link to clue/reactphp-ssdp.
• Corrects UPnP capitalization in comments and removes extra whitespace.

File	Description
README.md	Removes trailing whitespace from a code example.
examples/​ssdp.php	Fixes the loop class reference and adds an SSDP project link.
examples/​echo-received.php	Corrects UPnP capitalization in a comment.
examples/​dump-received.php	Corrects comment capitalization and removes a trailing blank line.

_{Review effort: Balanced}