Olá!
Os links da documentação sobre o DataFrame.write e DataFrameWriter.csv foram atualizados!
Segue os novos links:
DataFrameWriter: https://spark.apache.org/docs/latest/api/python/reference/pyspark.sql/api/pyspark.sql.DataFrameWriter.html#pyspark.sql.DataFrameWriter
DataFrameWriter.csv(*args): https://spark.apache.org/docs/latest/api/python/reference/pyspark.sql/api/pyspark.sql.DataFrameWriter.csv.html#pyspark.sql.DataFrameWriter.csv
property DataFrame.write: https://spark.apache.org/docs/latest/api/python/reference/pyspark.sql/api/pyspark.sql.DataFrame.write.html#pyspark.sql.DataFrame.write