Plaintext emails config switch

[MariusBluem]

• Document Provide an option to disable HTML emails server#9205

[MorrisJobke]

Is the entry in https://docs.nextcloud.com/server/13/admin_manual/configuration_server/config_sample_php_parameters.html#mail-parameters enough? Will be automatically appear once nextcloud/server#9231 is merged ;)

[MorrisJobke]

Was merged and the last entry in https://docs.nextcloud.com/server/13/admin_manual/configuration_server/config_sample_php_parameters.html#mail-parameters documents it now

[MariusBluem]

Yes. That’s enough.