Update Neo4j relationships count in lesson.adoc (#435)

If you count relationships directed as suggested in neo4j-graphacademy/genai-mcp-build-custom-tools-python#1 you get a new total.

Author: smithna

asciidoc/courses/genai-mcp-build-custom-tools-python/modules/2-database-features/lessons/2c-add-neo4j-connection/lesson.adoc

@@ -190,7 +190,7 @@ You should see the node and relationship counts from your database returned in t
 ------------------------------------------------------------
 {
   "nodes": 28863,
-  "relationships": 332522
+  "relationships": 1666261
 }
 ------------------------------------------------------------
 ----
@@ -238,4 +238,4 @@ In this challenge, you successfully added lifespan management to your MCP server
 
 Your server now properly manages the Neo4j driver lifecycle, creating it once on startup and reusing it across all tool calls.
 
-In the next lesson, you'll learn how to add more advanced database features to your MCP server.
+In the next lesson, you'll learn how to add more advanced database features to your MCP server.