test: Fix rolling log file doc and unit test

This was missed in #995.

Author: Techassi

crates/stackable-telemetry/src/tracing/mod.rs

@@ -149,7 +149,7 @@ pub enum Error {
 ///             Settings::builder()
 ///                 .with_environment_variable("TEST_FILE_LOG")
 ///                 .with_default_level(LevelFilter::INFO)
-///                 .file_log_settings_builder("/tmp/logs")
+///                 .file_log_settings_builder("/tmp/logs", "tracing-rs.log")
 ///                 .build()
 ///         )
 ///         .with_otlp_log_exporter(otlp_log_flag.then(|| {

crates/stackable-telemetry/src/tracing/settings/file_log.rs

@@ -113,7 +113,7 @@ mod test {
         let result = Settings::builder()
             .with_environment_variable("hello")
             .with_default_level(LevelFilter::DEBUG)
-            .file_log_settings_builder(PathBuf::from("/logs"), "tracing-rs.json")
+            .file_log_settings_builder(PathBuf::from("/logs"), "tracing-rs.log")
             .with_rotation_period(Rotation::HOURLY)
             .with_max_log_files(6)
             .build();