fix(week11): clarify .env.example placeholder and add sslmode

Rename the misleading `pipeline_user` placeholder to `your-pg-user`:
students' actual Week 9/10 logins are their own names, and a student who
keeps `pipeline_user` verbatim hits an auth failure. Also append
`?sslmode=require` so the example matches what the README already
instructs (line 69) and how Azure Postgres is meant to be reached.

Neither change caused the reported "relation dev_<name>.fct_trips does
not exist" error (that was a wrong database in a student's own .env),
but both remove a foot-gun and keep the example self-consistent.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: Lasse Benninga

week11-streamlit/.env.example

@@ -1,4 +1,6 @@
 # PostgreSQL connection string (your Week 9/10 login)
-POSTGRES_URL=postgresql://pipeline_user:your-pg-password@your-pg-host:5432/team1
+# Keep the database name as team1 and the ?sslmode=require suffix; only swap
+# in your own user, password, and host.
+POSTGRES_URL=postgresql://your-pg-user:your-pg-password@your-pg-host:5432/team1?sslmode=require
 # Your dev schema name (e.g. dev_jana)
 DB_SCHEMA=dev_yourname