expr: Redundunt text for asking `--help`

[mustafaelrasheid]

Description:
Some info is repeated when running expr --help.

Output:
(shortened)

$ ./expr --help
Print the value of EXPRESSION to standard output

Usage: expr [EXPRESSION]
       expr [OPTIONS]

Arguments:
  [expression]...

Options:
      --version  output version information and exit
      --help     display this help and exit

Print the value of EXPRESSION to standard output. A blank line below
separates increasing precedence groups.

EXPRESSION may be:

A lot of other utilities don't repeat their about text, so this is odd to say the least.
In this case, Print the value of EXPRESSION to standard output is repeated twice.