Fix mistake in documentation, Getting Started: Starting a Real Project, Adding Functions or Classes

[tnev]

https://github.com/hhvm/user-documentation/issues/1351

Where is the problem?

Documentation, Getting Started: Starting a Real Project, Adding Functions or Classes section, code example

What is the problem?

The code example is

use namespace HH\Lib\Vec;

function square_vec(vec<num> $numbers): vec<num> {
  return Vec\map($numbers, $number ==> $number * $number);
}

It then notes "If you then run hh_client, it will tell you of a mistake... To fix this, change the return type of the function from vec to vec."

However the return type is already num in the example.

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[Wilfred]

Thanks, D47734583.