docs: fix Scehma/Schema typo for Next button label on json-schema-examples page

A small typo made its way to the website in commit 72ae168 ("Added
navigation buttons in other sections of website (#1218)"), let's fix
that mistake.

Fixes: 72ae168 ("Added navigation buttons in other sections of website (#1218)")
Signed-off-by: Quentin Schulz <[email protected]>

Author: QSchulz

pages/learn/json-schema-examples.md

@@ -5,7 +5,7 @@ prev:
   label: Modeling a file system
   url: /learn/file-system
 next: 
-  label: JSON Scehma Glossary
+  label: JSON Schema Glossary
   url: /learn/glossary
 ---