docs: Improve env example
Remove `-` so you can use your editor's uncomment feature
Add the env vars to customize the server addresses
Document a bit more
# This is an example .env file showing all of the environment variables that can
# be configured within the project.
#
-#- INFLUXDB_IOX_DB_DIR=/home/user/.influxdb_iox
-#- TEST_INFLUXDB_IOX_DB_DIR=/home/user/.influxdb_iox
+# Where to store files on disk:
+# INFLUXDB_IOX_DB_DIR=/home/user/.influxdb_iox
+# TEST_INFLUXDB_IOX_DB_DIR=/home/user/.influxdb_iox
+#
+# Addresses for the server processes:
+# INFLUXDB_IOX_BIND_ADDR=127.0.0.1:8080
+# INFLUXDB_IOX_GRPC_BIND_ADDR=127.0.0.1:8082
#
# If using Amazon S3 as an object store:
-#- AWS_ACCESS_KEY_ID=access_key_value
-#- AWS_SECRET_ACCESS_KEY=secret_access_key_value
-#- AWS_DEFAULT_REGION=us-east-2
-#- AWS_S3_BUCKET_NAME=bucket_name
+# AWS_ACCESS_KEY_ID=access_key_value
+# AWS_SECRET_ACCESS_KEY=secret_access_key_value
+# AWS_DEFAULT_REGION=us-east-2
+# AWS_S3_BUCKET_NAME=bucket_name
#
# If using Google Cloud Storage as an object store:
-#- GCS_BUCKET_NAME=bucket_name
-#- SERVICE_ACCOUNT=/path/to/auth/info.json
\ No newline at end of file
+# GCS_BUCKET_NAME=bucket_name
+# SERVICE_ACCOUNT=/path/to/auth/info.json
