java/CommonsCliExample.java: improve the usage info in comment
java/CommonsCliExample.java: improve the usage info in comment

tcler/arg-parse-examples,tcler/arg-parse-examples,tcler/argparse-getopt-examples,tcler/arg-parse-examples,tcler/argparse-getopt-examples,tcler/arg-parse-examples,tcler/argparse-getopt-examples,tcler/argparse-getopt-examples,tcler/arg-parse-examples,tcler/argparse-getopt-examples