Update Webpack and Browserify example README files

Previously the commands were not properly parsed as such by GitHub
because they need to be indented with four spaces.

Furthermore, address some minor textual nits.

examples/browserify/README.md

@@ -1,25 +1,25 @@
 ## Overview
 
-Example to demonstrate PDF.js library usage with browserify.
+Example to demonstrate PDF.js library usage with Browserify.
 
 ## Getting started
 
 Build project and install the example dependencies:
 
-  $ gulp dist
-  $ cd examples/browserify
-  $ npm install
+    $ gulp dist
+    $ cd examples/browserify
+    $ npm install
 
-To build browserify bundles, run `gulp build`.  If you are running
+To build Browserify bundles, run `gulp build`. If you are running
 a web server, you can observe the build results at
 http://localhost:8888/examples/browserify/index.html
 
 See main.js, worker.js and gulpfile.js files. Please notice that PDF.js
 packaging requires packaging of the main application and PDF.js worker code,
-and the workerSrc path shall be set to the latter file.
+and the `workerSrc` path shall be set to the latter file.
 
 Alternatives to the gulp commands (without compression) are:
 
-  $ mkdir -p ../../build/browserify
-  $ node_modules/.bin/browserify main.js -o ../../build/browserify/bundle.js
-  $ node_modules/.bin/browserify worker.js -o ../../build/browserify/pdf.worker.bundle.js
+    $ mkdir -p ../../build/browserify
+    $ node_modules/.bin/browserify main.js -o ../../build/browserify/bundle.js
+    $ node_modules/.bin/browserify worker.js -o ../../build/browserify/pdf.worker.bundle.js

examples/webpack/README.md

@@ -1,18 +1,18 @@
 ## Overview
 
-Example to demonstrate PDF.js library usage with webpack.
+Example to demonstrate PDF.js library usage with Webpack.
 
 ## Getting started
 
 Build project and install the example dependencies:
 
-  $ gulp dist
-  $ cd examples/webpack
-  $ npm install
+    $ gulp dist
+    $ cd examples/webpack
+    $ npm install
 
-To build webpack bundles, run `node_modules/.bin/webpack`.  If you are running
+To build Webpack bundles, run `node_modules/.bin/webpack`. If you are running
 a web server, you can observe the build results at
 http://localhost:8888/examples/webpack/index.html
 
 See main.js and webpack.config.js files. Please notice that PDF.js packaging
-requires 'entry' loader.
+requires the `entry` loader.