Update apps/portal/src/app/ai/chat/migrate-from-nebula/page.mdx

Co-authored-by: graphite-app[bot] <96075541+graphite-app[bot]@users.noreply.github.com>
Signed-off-by: samina <[email protected]>

Author: saminacodes

apps/portal/src/app/ai/chat/migrate-from-nebula/page.mdx

@@ -147,7 +147,7 @@ context: {
 
 </Step>
 
-<Step title="Session Manangement">
+<Step title="Session Management">
 - Session ID is now optional and nested within the context object
 - If not provided, a new session will be created automatically
 - Sssions enable conversation continuity