Change in coreboot[master]: Documentation: Describe recommonmark's auto_toc_tree

[Philipp Deppenwiese (Code Review)]

Philipp Deppenwiese has submitted this change and it was merged. ( https://review.coreboot.org/28427 )

Change subject: Documentation: Describe recommonmark's auto_toc_tree
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Documentation: Describe recommonmark's auto_toc_tree

Explain recommonmark's auto_toc_tree and give an example to make writing
documentation easier. Show an example what happens if the document
isn't included in any toctree.

Change-Id: I4938d8d292ea890caec6d396b4fa04da65e398f4
Signed-off-by: Patrick Rudolph 
Reviewed-on: https://review.coreboot.org/28427
Tested-by: build bot (Jenkins) 
Reviewed-by: Tom Hiller 
Reviewed-by: Philipp Deppenwiese 
---
M Documentation/getting_started/writing_documentation.md
1 file changed, 26 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Philipp Deppenwiese: Looks good to me, approved
  Tom Hiller: Looks good to me, but someone else must approve

diff --git a/Documentation/getting_started/writing_documentation.md b/Documentation/getting_started/writing_documentation.md
index d57244a..0ba17e3 100644
--- a/Documentation/getting_started/writing_documentation.md
+++ b/Documentation/getting_started/writing_documentation.md
@@ -74,6 +74,32 @@
     +------------+------------+-----------+
     ``` #just a code block is enough

+## TocTree
+
+To make sure that all documents are included into the final documentation, you
+must reference each document from at least one *toctree*. The *toctree* must
+only reference files in the same folder or in subfolders !
+To create a toctree, simply use a bullet list or numbered list with a single
+reference. References in regular text aren't considered as *toctree* .
+This feature is enabled by recommonmark's *enable_auto_toc_tree* .
+
+**Example toctree:**
+
+```
+* [Chapter 1](chapter1.md)
+* [Chapter 2](chapter2.md)
+* [Subchapter](sub/index.md)
+```
+
+```
+1. [Chapter 1](chapter1.md)
+2. [Chapter 2](chapter2.md)
+```
+
+If you do only reference the document, but do not include it in any toctree,
+you'll see the following warning:
+**WARNING: document isn't included in any toctree**
+
 [coreboot]: https://coreboot.org
 [Documentation]: https://review.coreboot.org/cgit/coreboot.git/tree/Documentation
 [shpinx-autobuild]: https://github.com/GaretJax/sphinx-autobuild