template: use dashes instead of underscores for neo4j-cypher package …

…and path in readme (langchain-ai#12827)

Minimal readme template update

underscores didn't work, dashes do

templates/neo4j-cypher/README.md

@@ -42,13 +42,13 @@ pip install -U langchain-cli
 To create a new LangChain project and install this as the only package, you can do:
 
 ```shell
-langchain app new my-app --package neo4j_cypher
+langchain app new my-app --package neo4j-cypher
 ```
 
 If you want to add this to an existing project, you can just run:
 
 ```shell
-langchain app add neo4j_cypher
+langchain app add neo4j-cypher
 ```
 
 And add the following code to your `server.py` file:
@@ -86,5 +86,5 @@ We can access the template from code with:
 ```python
 from langserve.client import RemoteRunnable
 
-runnable = RemoteRunnable("http://localhost:8000/neo4j_cypher")
+runnable = RemoteRunnable("http://localhost:8000/neo4j-cypher")
 ```