docs: Use mysql as default example backend

Author: Eragonfr

config/local.example.toml

@@ -5,12 +5,11 @@ human_logs = 1
 
 # Example Syncstorage settings:
 # Example MySQL DSN:
-#syncstorage.database_url = "mysql://sample_user:sample_password@localhost/syncstorage_rs"
+syncstorage.database_url = "mysql://sample_user:sample_password@localhost/syncstorage_rs"
 # Example Spanner DSN:
 # database_url="spanner://projects/SAMPLE_GCP_PROJECT/instances/SAMPLE_SPANNER_INSTANCE/databases/SAMPLE_SPANNER_DB"
 # Example SQLite DSN:
 # database_url="sqlite://PATH_TO_FILE/FILE.sqlite"
-syncstorage.database_url = ":memory:"
 
 # enable quota limits
 syncstorage.enable_quota = 0
@@ -20,8 +19,7 @@ syncstorage.enabled = true
 syncstorage.limits.max_total_records = 1666 # See issues #298/#333
 
 # Example Tokenserver settings:
-#tokenserver.database_url = "mysql://sample_user:sample_password@localhost/tokenserver_rs"
-tokenserver.database_url = ":memory:"
+tokenserver.database_url = "mysql://sample_user:sample_password@localhost/tokenserver_rs"
 tokenserver.enabled = true
 tokenserver.fxa_email_domain = "api-accounts.stage.mozaws.net"
 tokenserver.fxa_metrics_hash_secret = "INSERT_SECRET_KEY_HERE"