ruby: disable doc for *-musl
ruby: disable doc for *-musl

As a workaround for segfaults on the builders when trying to generate
the documentation for ruby disable the doc for *-musl for now.

NeoChontrix/void-packages,coredumb/void-packages,floGik/void-packages,floGik/void-packages,NeoChontrix/void-packages,floGik/void-packages,coredumb/void-packages,NeoChontrix/void-packages,necrophcodr/void-packages,NeoChontrix/void-packages,coredumb/void-packages,floGik/void-packages,floGik/void-packages,coredumb/void-packages,necrophcodr/void-packages,NeoChontrix/void-packages,necrophcodr/void-packages,necrophcodr/void-packages,coredumb/void-packages,floGik/void-packages,necrophcodr/void-packages,coredumb/void-packages,NeoChontrix/void-packages