Update typography.md

docs/syntax/typography.md

@@ -295,5 +295,16 @@ that are not separated by a blank line
 This is not part of the footnote.
 :::
 
-By default, a transition line (with a `footnotes` class) will be placed before any footnotes.
-This can be turned off by adding `myst_footnote_transition = False` to the config file.
+By default, the footnotes will be collected, sorted and moved to the end of the document,
+with a transition line placed before any footnotes (that has a `footnotes` class).
+
+This behaviour can be modified using the [configuration options](#sphinx/config-options):
+
+```python
+myst_footnote_sort = False
+myst_footnote_transition = False
+```
+
+```{versionadded} 4.0.0
+``myst_footnote_sort`` configuration option
+```