Add batch link to docs

Author: jerelmiller

docs/source/_sidebar.yaml

@@ -195,6 +195,8 @@ items:
             href: ./api/link/apollo-link-base-batch-http
           - label: BatchHttpLink
             href: ./api/link/apollo-link-batch-http
+          - label: BatchLink
+            href: ./api/link/apollo-link-batch
           - label: ClientAwarenessLink
             href: ./api/link/apollo-link-client-awareness
           - label: ErrorLink

docs/source/api/link/apollo-link-batch.mdx

@@ -0,0 +1,26 @@
+---
+title: BatchLink
+description: Core batching functionality for grouping multiple GraphQL operations
+---
+
+<DocBlock
+  canonicalReference="@apollo/client/link/batch!BatchLink:class"
+  customOrder={["summary", "remarks", "example"]}
+/>
+
+## Constructor signature
+
+```ts
+constructor(
+  options?: BatchLink.Options
+): BatchLink
+```
+
+## Types
+
+<InterfaceDetails
+  canonicalReference="@apollo/client/link/batch!BatchLink.Options:interface"
+  headingLevel={3}
+  displayName="BatchLink.Options"
+/>
+