DOCSP-35889 Missing Redirect for First Array Element Operator (#6001)

* DOCSP-35889 Missing Redirect for First Array Element Operator

* bump version boundary to 6.1+

Author: ajhuh-mdb

config/redirects

@@ -2570,3 +2570,6 @@ raw: https://mongodb.github.io/mongo-java-driver/ -> ${base}/drivers/java/sync/c
 [*-v6.3]: ${prefix}/${version}/data-modeling/schema-design-process/map-relationships -> ${base}/${version}/core/data-modeling-introduction
 [v7.0-*]: ${prefix}/${version}/core/data-modeling-introduction -> ${base}/${version}/data-modeling
 [v7.0-*]: ${prefix}/${version}/core/data-model-design -> ${base}/${version}/data-modeling/embedding-vs-references
+
+# DOCSP-35889 
+(v6.1-*]: ${prefix}/${version}/reference/operator/aggregation/first-array-element -> ${base}/${version}/reference/operator/aggregation/first/