DOC:configuration.md: Change description of interval.
DOC:configuration.md: Change description of interval.

Signed-off-by: Masataka Mizukoshi <f81ade9184ecb39a6656406eb7293fdae3bb3bd7@gmail.com>

estesp/distribution,duglin/distribution,cezarsa/distribution,shyr/distribution,miminar/distribution,manoj535/distribution,vdemeester/distribution,yuwaMSFT2/distribution,docker/distribution,miminar/distribution,sadlil/distribution,shyr/distribution,huamai-io/distribution,cezarsa/distribution,vdemeester/distribution,sergeyfd/distribution,sergeyfd/distribution,duglin/distribution,manoj535/distribution,konstruktoid/distribution,dmcgowan/distribution,estesp/distribution,docker/distribution,mikebrow/distribution,huamai-io/distribution,mikebrow/distribution,konstruktoid/distribution,jzwlqx/distribution,dmcgowan/distribution,harrisonfeng/distribution,harrisonfeng/distribution,thaJeztah/distribution,sadlil/distribution,thaJeztah/distribution,jwhonce/distribution,jwhonce/distribution,jzwlqx/distribution,yuwaMSFT2/distribution