Remove lint warnings

lib/common/parse-features-string.js

@@ -1,12 +1,11 @@
 // parses a feature string that has the format used in window.open()
-// - `str` input string
+// - `features` input string
 // - `emit` function(key, value) - called for each parsed KV
 module.exports = function parseFeaturesString (features, emit) {
   // split the string by ','
   features.split(/,\s*/).forEach((feature) => {
-    // expected form is either a key by itself (true boolean flag)
-    // or a key/value, in the form of 'key=value'
-    // split the tokens by '='
+    // expected form is either a key by itself or a key/value pair in the form of
+    // 'key=value'
     let [key, value] = feature.split(/\s*=/)
     if (!key) return