[HOTFIX][SPARK-12000] Add missing quotes in Jekyll API docs plugin.
[HOTFIX][SPARK-12000] Add missing quotes in Jekyll API docs plugin.

I accidentally omitted these as part of #10049.

haowu80s/spark,haowu80s/spark,haowu80s/spark,haowu80s/spark,haowu80s/spark,haowu80s/spark