Fix sample links in features.md
Fix sample links in features.md
beancount/fava,beancount/fava,aumayr/beancount-web,yagebu/fava,beancount/fava,yagebu/fava,beancount/fava,aumayr/beancount-web,yagebu/fava,beancount/fava,aumayr/beancount-web,yagebu/fava,yagebu/fava,aumayr/beancount-web