Update comments

Author: ehmicky

examples/convert.js

@@ -1,5 +1,5 @@
 #!/usr/bin/env node
-// This example demonstrates the `convert()` command in JavaScript.
+// Demo of the `convert()` command in JavaScript.
 // This file can be directly run:
 //   - first install `unix-permissions`
 //   - then `node node_modules/unix-permissions/examples/convert.js`

examples/convert.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# This example demonstrates the `convert` command in the terminal (Bash).
+# Demo of the `convert` command in the terminal (Bash).
 # This file can be directly run:
 #   - first install `unix-permissions`
 #   - then `bash node_modules/unix-permissions/examples/convert.sh`