'cipher' vs 'cypher' in Undertow attribute description

In Undertow https-listener, there is an attribute 'enabled-cipher-suites' witch description 'Configures Enabled SSL cyphers'. See that attribute contains 'cipher' and description 'cypher'. I believe we should keep those consistent.

I have grepped source codebase of Undertow, Wildfly and EAP docs and it seems that except this (and related) we prefer 'cipher' spelling. Thus we should reword description of mentioned attribute too.

Appropriate change needs to be done also in documentation, where https-listener attributes description is mentioned.