Update for redisvl 0.8.0 (#1958)

Co-authored-by: redisdocsapp[bot] <177626021+redisdocsapp[bot]@users.noreply.github.com>

Author: github-actions[bot]

content/develop/ai/redisvl/api/query.md

@@ -835,7 +835,7 @@ returned in addition to any others implicitly specified.
 Otherwise, fields should be given in the format of @field.
 
 * **Parameters:**
-  **fields** (*List* *[* *str* *]*)
+  **fields** (*str*)
 * **Return type:**
   *AggregateRequest*
 
@@ -876,7 +876,7 @@ AggregateRequest()            .group_by("@customer", r.sum("@paid").alias(FIELDN
 ``
 
 * **Parameters:**
-  **fields** (*List* *[* *str* *]*)
+  **fields** (*str*)
 * **Return type:**
   *AggregateRequest*