Merge pull request #3620 from emekaelo/patch-1

bug: Update part12b.md with correct docker compose file name for mongo

Author: mluukkai

src/content/12/en/part12b.md

@@ -425,7 +425,7 @@ This file will initialize the database with a user and a few todos. Next, we nee
 
 We could create a new image FROM mongo and COPY the file inside, or we can use a [bind mount](https://docs.docker.com/storage/bind-mounts/) to mount the file <i>mongo-init.js</i> to the container. Let's do the latter.
 
-Bind mount is the act of binding a file (or directory) on the host machine to a file (or directory) in the container. A bind mount is done by adding a _-v_ flag with _container run_. The syntax is _-v FILE-IN-HOST:FILE-IN-CONTAINER_. Since we already learned about Docker Compose let's skip that. The bind mount is declared under key <i>volumes</i> in docker-compose-yml. Otherwise the format is the same, first host and then container:
+Bind mount is the act of binding a file (or directory) on the host machine to a file (or directory) in the container. A bind mount is done by adding a _-v_ flag with _container run_. The syntax is _-v FILE-IN-HOST:FILE-IN-CONTAINER_. Since we already learned about Docker Compose let's skip that. The bind mount is declared under key <i>volumes</i> in docker-compose.dev.yml. Otherwise the format is the same, first host and then container:
 
 ```yml
   mongo: