Fix typo in Yoga Layout documentation
Fix typo in Yoga Layout documentation

Summary: Found and fixed typo on https://yogalayout.com/docs/justify-content/

Reviewed By: danielbuechele

Differential Revision: D13199988

fbshipit-source-id: 029cf812f09c48822ec11b054bf0c987f718191d

facebook/yoga,facebook/css-layout,facebook/yoga,facebook/css-layout,facebook/yoga,facebook/yoga,facebook/yoga,facebook/css-layout,facebook/css-layout,facebook/css-layout,facebook/css-layout,facebook/css-layout,facebook/yoga,facebook/yoga,facebook/yoga,facebook/css-layout,facebook/yoga,facebook/yoga,facebook/css-layout