Update comment in Drupal\Tests\RandomGeneratorTrait::randomStringValidate()

We can replace the whole if statement along with comment here

// Consecutive spaces causes issues for
    // \Drupal\simpletest\WebTestBase::assertLink().
    if (preg_match('/\s{2,}/', $string)) {
      return FALSE;
    }

Adding a patch as commented in #2.

Are we sure that two spaces is OK elsewhere? e.g. in HTML two or more spaces are collapsed to one. I think this is technically an API change as previously a string with two spaces would not validate and now it will, so maybe we should just fix the comment?

Agreed! Just updating the comment.

Committed and pushed 8be5edace1 to 9.1.x and 8fb84dad69 to 9.0.x. Thanks!

backpoorted too 9.0.x cause docs.