Flexible heredoc/nowdoc is undocumented

[astiob]

From manual page: https://php.net/language.types.string

---

Heredoc documentation still insists, with a big red warning box and an example, that the closing marker must be by itself on a line without leading whitespace and trailed by only at most a semicolon. This is not true since PHP 7.3, which introduced “flexible” heredoc/nowdoc syntax.

[cmb69]

This has already been reported as https://bugs.php.net/bug.php?id=78425. Not sure which one to close as duplicate.