mod_pubsub_summary: Use pre-escaped UTF-8 sequence for compat This silences a warning about using the non-existent global 'utf8' each time this line was hit. The utf8 library was introduced in Lua 5.3, so the warning would appear with 5.1 and 5.2.

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summary: External Service Discovery
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This module implementing [XEP-0215] is included with Prosody 0.12 but made available here for older versions.

Documentation is available on the [Prosody site][doc:modules:mod_external_services].