Found it guys! The text that is in the example on https://codex.www.ads-software.com/Post_Meta_Data_Section is located in a file called single.php.
The path I took to get to it is:
wp-content/themes/default/single.php
For me, Line 29 of the file starts the text “This entry was posted.”
Use this in good fun and not to destroy planets.
-TFX51-
