fix three dead links on SDK capabilities page (#356)

Co-authored-by: Patrick <[email protected]>

Author: patrickthornton

fern/products/sdks/capabilities.mdx

@@ -1,7 +1,7 @@
 ---
 title: Capabilities
-description: Fern SDKs are built to have every feature you need. 
-subtitle: Fern SDKs are built to have every feature you need. 
+description: Fern SDKs are built to have every feature you need.
+subtitle: Fern SDKs are built to have every feature you need.
 layout: overview
 ---
 
@@ -27,7 +27,7 @@ layout: overview
   <Card title="Registry Publishing" icon="fa-duotone fa-box">
     Fern will automatically publish your SDKs to registries like npm, PyPI, and Maven
   </Card>
-  <Card title="Auto-Pagination" icon="fa-solid fa-list" href="/sdks/deep-dives/configure-auto-pagination">
+  <Card title="Auto-Pagination" icon="fa-solid fa-list" href="/sdks/deep-dives/auto-pagination">
     Paginate through API responses easily with offset, cursor, and link-based pagination.
     <p className="text-(color:--grayscale-a11) font-bold mt-2 flex items-center gap-1">
       Learn more
@@ -44,7 +44,7 @@ layout: overview
   <Card title="Webhook Signature Verification" icon="fa-duotone fa-key">
     Verify the signature of incoming webhook requests
   </Card>
-  <Card title="Idempotency Headers" icon="fa-solid fa-shield" href="/sdks/deep-dives/configure-idempotency">
+  <Card title="Idempotency Headers" icon="fa-solid fa-shield" href="/sdks/deep-dives/idempotency">
     Built-in protection against duplicate submissions
     <p className="text-(color:--grayscale-a11) font-bold mt-2 flex items-center gap-1">
       Learn more
@@ -69,7 +69,7 @@ layout: overview
       <img src="./images/arrow-right-white.svg" alt="Arrow right light" className="arrow-right hidden dark:block m-0 h-4 w-4" noZoom />
     </p>
   </Card>
-  <Card title="Merging Multiple APIs" icon="fa-duotone fa-code-merge" href="/sdks/overview/set-up-the-fern-folder#configure-multiple-apis">
+  <Card title="Merging Multiple APIs" icon="fa-duotone fa-code-merge" href="/sdks/overview/quickstart#configure-multiple-apis">
     Multiple API Definitions. One SDK.
     <p className="text-(color:--grayscale-a11) font-bold mt-2 flex items-center gap-1">
       Learn more