docs(fix): typos in comments (#67)

Author: shadowspawn

index.js

@@ -149,7 +149,7 @@ const parseArgs = (
         // withValue option should also support setting values when '=
         // isn't used ie. both --foo=b and --foo b should work
 
-        // If withValue option is specified, take next position arguement as
+        // If withValue option is specified, take next position argument as
         // value and then increment pos so that we don't re-evaluate that
         // arg, else set value as undefined ie. --foo b --bar c, after setting
         // b as the value for foo, evaluate --bar next and skip 'b'
@@ -160,12 +160,12 @@ const parseArgs = (
       } else {
         // Cases when an arg is specified without a value, example
         // '--foo --bar' <- 'foo' and 'bar' flags should be set to true and
-        // shave value as undefined
+        // save value as undefined
         storeOptionValue(options, arg, undefined, result);
       }
 
     } else {
-      // Arguements without a dash prefix are considered "positional"
+      // Arguments without a dash prefix are considered "positional"
       ArrayPrototypePush(result.positionals, arg);
     }