Fix: correct four factual errors found during accuracy review

- Ch. 2: replace obsolete orgmode.org/elpa/ archive with GNU ELPA note
- Ch. 5: replace duplicate C-c C-x C-v with correct org-toggle-link-display
- Ch. 6: replace non-built-in :DEPENDS: example with :ORDERED: t approach;
  clarify org-depend.el/org-edna needed for arbitrary cross-task dependencies
- Ch. 9: fix :scope nil description from "Current subtree" to
  "Current buffer (or narrowed region)"

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: DavidLiedle

02-getting-started.org

@@ -43,12 +43,12 @@ If you last tried Emacs in 1999, prepare to be pleasantly surprised. Modern Emac
 
 Here's the good news: if you're running Emacs 22.1 or later (and you definitely are), Org-Mode is already installed. No package manager wrestling required for basic functionality.
 
-That said, you might want to update to the latest version:
+That said, you might want to update to the latest version. Org-mode is available on GNU ELPA, which is included in Emacs by default:
 
 #+begin_src elisp
 ;; Add to your ~/.emacs or ~/.emacs.d/init.el
 (require 'package)
-(add-to-list 'package-archives '("org" . "https://orgmode.org/elpa/") t)
+(package-initialize)
 #+end_src
 
 Then =M-x package-install RET org RET=

05-links-and-images.org

@@ -302,9 +302,9 @@ The Org manual[fn:1] contains everything, though it's dense[fn::inline footnote
 
 * Link Appearance
 
-By default, links show their description text. To see the underlying link:
+By default, links show their description text. To see the underlying link syntax:
 
-- =C-c C-x C-v= - Toggle link display (show raw links vs. descriptions)
+- =M-x org-toggle-link-display= - Toggle between showing descriptions and raw link syntax
 
 Useful when editing or debugging links.
 

06-todo-items.org

@@ -272,18 +272,15 @@ Why track effort? Because agenda views can show your task load, help plan your d
 
 * Blocking and Dependencies
 
-Some tasks can't start until others finish:
+Some tasks can't start until others finish. The built-in approach uses the =:ORDERED:= property on a parent heading:
 
 #+begin_example
-* TODO Write code
+* TODO Project
   :PROPERTIES:
-  :ID: task-write-code
-  :END:
-
-* TODO Write tests
-  :PROPERTIES:
-  :DEPENDS: task-write-code
+  :ORDERED: t
   :END:
+** TODO Write code
+** TODO Write tests
 #+end_example
 
 Enable blocking:
@@ -292,9 +289,9 @@ Enable blocking:
 (setq org-enforce-todo-dependencies t)
 #+end_src
 
-Now you can't mark "Write tests" as DONE until "Write code" is complete. Org enforces task order.
+Now you can't mark "Write tests" as DONE until "Write code" is complete. Org enforces task order within any heading that has =:ORDERED: t=.
 
-For more complex dependencies, use =org-edna= package. It supports:
+For arbitrary dependencies between unrelated tasks (not parent/child), use the contributed =org-depend.el= or the =org-edna= package. Both support:
 - Task chains
 - Conditional triggers
 - Scheduled dependencies

09-clocking-time-tracking.org

@@ -92,7 +92,7 @@ Boom. Time report. Update anytime with =C-c C-c=.
 - =:scope file= - Current file only
 - =:scope agenda= - All agenda files
 - =:scope subtree= - Current subtree only
-- =:scope nil= - Current subtree
+- =:scope nil= - Current buffer (or narrowed region)
 - =:scope ("file1.org" "file2.org")= - Specific files
 
 *Time range:*