Fix docs on default build image name

150fd4b8cfa39726e68c12fc0fd45ac4e0f20c5f changed the default separator from _ to -, but the docker compose build docs still mention _.

Signed-off-by: Sebastian Correa <[email protected]>

docs/reference/compose_build.md

@@ -23,7 +23,7 @@ Build or rebuild services
 
 ## Description
 
-Services are built once and then tagged, by default as `project_service`.
+Services are built once and then tagged, by default as `project-service`.
 
 If the Compose file specifies an
 [image](https://github.com/compose-spec/compose-spec/blob/master/spec.md#image) name,

docs/reference/docker_compose_build.yaml

@@ -1,7 +1,7 @@
 command: docker compose build
 short: Build or rebuild services
 long: |-
-    Services are built once and then tagged, by default as `project_service`.
+    Services are built once and then tagged, by default as `project-service`.
 
     If the Compose file specifies an
     [image](https://github.com/compose-spec/compose-spec/blob/master/spec.md#image) name,