removed lambda from sortByKey()
removed lambda from sortByKey()

According to the documentation the sortByKey method does not take a lambda as an argument, thus the example is flawed. Removed the argument completely as this will default to ascending sort.

Author: Udo Klein <git@blinkenlight.net>

Closes #10640 from udoklein/patch-1.

(cherry picked from commit bd723bd53d9a28239b60939a248a4ea13340aad8)
Signed-off-by: Sean Owen <291c18f3fb7528c712d9098b0e50a515ea0b91d5@cloudera.com>

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