Update changelog with details on toggle hint functions

Expanded the changelog entry for syncToggleHint and syncAllToggleHints to clarify that these functions allow automatic updating of button hint text when the open or closed state changes.

Author: douden

CHANGELOG.md

@@ -5,7 +5,7 @@
 ### Added
 
 - Support for more languages in toggle button text (see README for full list) [#66](https://github.com/executablebooks/sphinx-togglebutton/pull/66).
-- Added new functions (syncToggleHint, syncAllToggleHints) to dynamically update toggle button hints based on the current state  [#66](https://github.com/executablebooks/sphinx-togglebutton/pull/66).
+- Added new functions (syncToggleHint, syncAllToggleHints) to dynamically update toggle button hints based on the current state  [#66](https://github.com/executablebooks/sphinx-togglebutton/pull/66). This allows developers to change the open or closed state of an element and have the button hint text update accordingly automatically.
 
 ### Fixed