Update documentation around log_spans

pict-rs.toml

@@ -74,6 +74,11 @@ format = 'normal'
 # Follows the same format as RUST_LOG
 targets = 'warn,tracing_actix_web=info,actix_server=info,actix_web=info'
 
+## Optional: whether pict-rs should log the new & close span events for tracing spans to stdout
+# environment variable: PICTRS__TRACING__LOGGING__LOG_SPANS
+# default: false
+log_spans = false
+
 
 ## Console configuration
 [tracing.console]

releases/0.5.0.md

@@ -343,6 +343,18 @@ pict-rs 0.5 no longer logs the opening and closing of tracing spans. This means
 be mostly empty aside from the occasional warning or error. Errors should still provide ample debug
 information, so the decrease in verbosity should not negatively affect debugging of the program.
 
+These spans can be re-enabled by setting a configuration option or passing a commandline flag.
+```toml
+[tracing.logging]
+log_spans = true
+```
+```bash
+PICTRS__TRACING__LOGGING__LOG_SPANS=true
+```
+```bash
+pict-rs --log-spans
+```
+
 
 ### Quality Configuration