docs: improve some comments

lib/clark-plugin.js

@@ -77,6 +77,7 @@ module.exports = class ClarkPlugin extends Plugin {
 
       // https://github.com/csstools/postcss-preset-env
       // Adds vendor prefixes based on Can I Use and polyfills new features
+      // Inspired by https://github.com/moxystudio/postcss-preset-moxy/blob/master/index.js
       require('postcss-preset-env')({
         browsers: this.browsers,
 
@@ -85,10 +86,10 @@ module.exports = class ClarkPlugin extends Plugin {
 
         // Disable `preserve` so that the resulting CSS is consistent among all
         // browsers, diminishing the probability of discovering bugs only when
-        // testing in older browsers
+        // testing in older browsers.
         preserve: false,
 
-        // Enable features that we want, despite being proposals yet
+        // Explicitly enable features that we want, despite being proposals yet.
         features: {
           'custom-selectors': true,
           'custom-properties': true,
@@ -98,8 +99,8 @@ module.exports = class ClarkPlugin extends Plugin {
         },
 
         autoprefixer: {
-          // We don't use prefixes unless they are really necessary, e.g. when
-          // dealing with quirks therefore, we disable removing them.
+          // We don't manually apply prefixes unless they are really necessary,
+          // e.g.when dealing with quirks, therefore we disable removing them.
           remove: false
         }
       })