Fix meta title and description of issues guide

Author: fabian-hiller

website/src/routes/guides/(main-concepts)/issues/index.mdx

@@ -1,8 +1,8 @@
 ---
-title: Errors
+title: Issues
 description: >-
-  For error handling I use internally with `ValiError` my own error class, which
-  supports you in case of an issue, with extensive information.
+  When validating unknown data against a schema, I collect detailed information
+  about each issue.
 contributors:
   - fabian-hiller
   - alonidiom