[BUG] incorrect org-mode dynamic blocks docs [9.5.4 (release_9.5.4-3-g6dc785 @ /usr/local/share/emacs/29.0.50/lisp/org/)]

[pva-outdoor]

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------------------------------------------------------------------------
Hello, team!

Please check the following documentation (or implementation) of dynamic
blocks:

1. It seems that dynamic blocks can't have inner headlines (the
org-dblock-write:xxx should not produce them). Otherwise the block will
be parsed incorrectly (not mentioned in docs for org-mode).

Example: Create the following 1.org and export it to unicode text (press
C-c C-e t U). You will see "#+BEGIN: block2" as text.

  * Block2
  
  #+BEGIN: block2
  ** Section 1
  asdasdsad
  #+END:
  
2. Org-mode info file says:

     Dynamic blocks, like any other block, can be narrowed with
  ‘org-narrow-to-block’.

That would not work because of implementation of org-narrow-to-block:

(defun org-narrow-to-block ()
  "Narrow buffer to the current block."
  (interactive)
  (let* ((case-fold-search t)
         (blockp (org-between-regexps-p "^[ \t]*#\\+begin_.*"  <----
                                        "^[ \t]*#\\+end_.*")))
    (if blockp
        (narrow-to-region (car blockp) (cdr blockp))
      (user-error "Not in a block"))))



There is also a minor bug in org-mode (sould I report it
in it's own mail?):

If you press C-c C-, [RET] [RET] You'll get:

#+begin_
#+end_nil

while one could expect either begin_nil or end_. 


Emacs  : GNU Emacs 29.0.50 (build 4, x86_64-pc-linux-gnu, GTK+ Version 3.24.34, 
cairo version 1.17.6)
 of 2022-07-15
Package: Org mode version 9.5.4 (release_9.5.4-3-g6dc785 @ 
/usr/local/share/emacs/29.0.50/lisp/org/)
-- 
Best regards,
Andrey Petrov.