[Sync EN] ext/yar: Revise the Yar documentation: protocol chapter, examples and clarifications (#5815)

[github-actions]

Commit: https://github.com/php/doc-en/commit/60ce1c5c7cc6d340191828de21f1d6b48cd83807
PR: https://github.com/php/doc-en/pull/5815

Archivos ES a actualizar

• reference/yar/book.xml
• reference/yar/constants.xml
• reference/yar/examples.xml
• reference/yar/setup.xml
• reference/yar/yar-concurrent-client.xml
• reference/yar/yar-server.xml
• reference/yar/yar_client/call.xml
• reference/yar/yar_client/construct.xml
• reference/yar/yar_client/getopt.xml
• reference/yar/yar_client/setopt.xml
• reference/yar/yar_client_exception/gettype.xml
• reference/yar/yar_concurrent_client/call.xml
• reference/yar/yar_concurrent_client/loop.xml
• reference/yar/yar_concurrent_client/reset.xml
• reference/yar/yar_server/construct.xml
• reference/yar/yar_server/handle.xml
• reference/yar/yar_server_exception/gettype.xml

Nuevos archivos EN (aún no traducidos)

• reference/yar/protocol.xml