Remove unsupported backticks from changelog title (#18154)

Author: garrettgu10

src/content/changelogs/vectorize.yaml

@@ -6,7 +6,7 @@ productArea: Developer platform
 productAreaLink: /workers/platform/changelog/platform/
 entries:
   - publish_date: "2024-11-13"
-    title: Added support for `$in` and `$nin` metadata filters
+    title: Added support for $in and $nin metadata filters
     description: |-
       Vectorize now supports `$in` and `$nin` clauses in [metadata filters](/vectorize/reference/metadata-filtering/).