[gi-docgen/ebassi/related-libraries: 3/3] docs: Update the project configuration page

[Emmanuele Bassi <ebassi src gnome org>]

commit 86e27357215b5afc9a45bf9286a39b28abe00b9e
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Sat Feb 12 16:42:26 2022 +0000

    docs: Update the project configuration page
    
    List the new constraint on the dependencies key, and the newly added
    related key.

 docs/project-configuration.rst | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)
---
diff --git a/docs/project-configuration.rst b/docs/project-configuration.rst
index 728a8d4..30d403c 100644
--- a/docs/project-configuration.rst
+++ b/docs/project-configuration.rst
@@ -51,10 +51,20 @@ The following keys are used, if found:
 ``description`` = ``s``
   A short description of the library.
 
-``dependencies`` = ``dict(s, dict(s, s)``
+``dependencies`` = ``dict(s, dict(s, s))``
   A dictionary of dependencies; each entry in the dictionary has a key in the
   form of ``{namespace}-{version}``, and values in the form of a dictionary
-  with the following keys: ``name``, ``description``, and ``docs_url``.
+  with the following keys: ``name``, ``description``, and ``docs_url``. Each
+  entry in the this dictionary can only describe a namespace included in the
+  introspection data; any other namespace listed here will be ignored. See
+  the ``related`` configuration below.
+
+``related`` = ``dict(s, dict(s, s))``
+  A dictionary of related namespaces; each entry in the dictionary has a key
+  in the form of ``{namespace}-{version}``, and values in the form of a
+  dictionary with the following keys: ``name``, ``description``, and
+  ``docs_url``. Each entry in this dictionary can describe a namespace that
+  is related to the project.
 
 ``devhelp`` = ``b``
   Whether gi-docgen should generate a DevHelp file for the namespace.