fix documentation / oxford comma

Author: ntindall

README.md

@@ -198,10 +198,9 @@ Options:
 
 #### `npm-shrinkwrap check`
 
-Asserts that your `npm-shrinkwrap.json` file and node_modules
-  directory are in sync. If any excess modules are in your
-  node_modules folder, `check` will return an error and print
-  a list of the excess dependencies that are installed.
+Asserts that your `npm-shrinkwrap.json` file, `package.json` file,
+  and node_modules directory are in sync. If any inconsistency
+  is found, an error is returned.
 
 Options:
     --dirname   sets the directory of the npm-shrinkwrap.json

bin/cli.js

@@ -75,9 +75,6 @@ function main(opts, callback) {
                 'into node_modules');
         });
     } else if (command === 'check') {
-        // Otherwise, we check to see if any erroneous dependencies are
-        // installed.
-        //
         // We set opts.dry to true, which suppresses all side effects in the
         // shrinkShrinkwrap routine.
         opts.dry = true;

bin/usage.md

@@ -36,10 +36,9 @@ Options:
 
 ## `{cmd} check`
 
-Asserts that your `npm-shrinkwrap.json` file and node_modules
-  directory are in sync. If any excess modules are in your
-  node_modules folder, `check` will return an error and print
-  a list of the excess dependencies that are installed.
+Asserts that your `npm-shrinkwrap.json` file, `package.json` file,
+  and node_modules directory are in sync. If any inconsistency
+  is found, an error is returned.
 
 Options:
     --dirname   sets the directory of the npm-shrinkwrap.json