fix doc element link; close #1177
fix doc element link; close #1177

rbessick5/PrairieLearn,rbessick5/PrairieLearn,rbessick5/PrairieLearn,mwest1066/PrairieLearn,mwest1066/PrairieLearn,mwest1066/PrairieLearn,parasgithub/PrairieLearn,rbessick5/PrairieLearn,rbessick5/PrairieLearn,parasgithub/PrairieLearn,parasgithub/PrairieLearn,mwest1066/PrairieLearn,parasgithub/PrairieLearn,parasgithub/PrairieLearn,mwest1066/PrairieLearn