Improve expository nature of my waffle about log levels

content/projects/go-lessons-learned/set-go-slog-levels-with-an-environment-variable.html

@@ -19,7 +19,11 @@
             <section id="introduction">
                 <p>
                     The examples in the <a href="https://pkg.go.dev/log/slog">slog docs</a> are pretty convoluted. Setting a log level via an environment variable's actually
-                    pretty simple. Here's the code. Note the function at the bottom called `getLogLevelFromEnv()` and that it's called in the HandlerOptions:
+                    pretty simple. Here's the code. By default the code is silent, set <code>LOG_LEVEL</code> in your environment to one of the strings "INFO", "DEBUG", "WARN" or "ERROR"
+                    to enable that level of logging. 
+                </p>
+                <p> 
+                    Note the function at the bottom called `getLogLevelFromEnv()` and that it's called in the HandlerOptions:
                 </p>
             </section>