docs: Fix typo in the Icon Themes page (#24516)

Affan Shahid created 

Release Notes:

- N/A

Change summary

docs/src/extensions/icon-themes.md | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

Detailed changes

docs/src/extensions/icon-themes.md 🔗 

@@ -30,7 +30,7 @@ Here is an example of the structure of an icon theme:
         "collapsed": "./icons/folder.svg",
         "expanded": "./icons/folder-open.svg"
       },
-      "chevon_icons": {
+      "chevron_icons": {
         "collapsed": "./icons/chevron-right.svg",
         "expanded": "./icons/chevron-down.svg"
       },