Update href for $elemMatch in TOC.yml

Author: abinav2307

articles/cosmos-db/mongodb/vcore/operators/projection/TOC.yml

@@ -1,7 +1,7 @@
 - name: $
   href: $.md
 - name: $elemMatch
-  href: $elemmatch.md
+  href: ../array-query/$elemmatch.md
 - name: $meta
   href: $meta.md
 - name: $slice