Help examples below the input in the field settings should be more clear

At the moment of this issue post, the help text under the PHP input field in the field settings is not very helpful. If a user with some PHP knowledge but new to Drupal 8 would try to follow the examples she/he would mostly do not get the awaited results since the examples are too generic (and maybe outdated?).

We tested it with a PHP trainee inhouse and he tried the given examples to get the value of a set up taxonomy term for this node with no success. The term value from another field in this node, which has been already set before does not appear and the user do not know what to do, since the examples do not clarify how they are meant.