Correct Example [#1338]

of: 211 Stony ground, walk (ISOM 2017-2)
from: Tramuntana forest, Croatia

Stony or rocky ground which reduces runnability to about 20-60% of normal
speed.

Stouny ground, walk in Tramuntana forest, Cres, Croatia. Photo by: Jiří Vištejn (CC BY-SA 4.0)