Fix up 'README.md'.

Author: DanielRosenwasser

README.md

@@ -4,37 +4,44 @@
 
 This tool is used to generate `dom.generated.d.ts` and `webworker.generated.d.ts` for TypeScript, and `domWeb.js` and `domWindows.js` for Visual Studio JavaScript language service. The input file is the XML spec file generated by the Microsoft Edge browser.
 
-## Build Instruction
-To build the tool, simply clone the repo, and run `build.cmd` (Windows) or `build.sh` (OS X/Unix) in command line. If it runs successfully, the output files will be generated under the `generated` folder.
+## Build Instructions
 
-Note: for OS X/ Unix users, [Mono 4.2](http://www.mono-project.com/download/alpha/) is required.
+To build the tool, simply clone this repo, and run `build.cmd` (Windows) or `build.sh` (OS X/Unix) on the command line.
+If it runs successfully, the output files will be generated under the `generated` folder.
 
-## Contribution Guide
-The `dom.generated.d.ts` and `webworker.generated.d.ts` files in the TypeScript repo are used as baselines. 
-For each pull request, we will run the script and compare the generated files with the baseline files. 
-In order to make the tests pass, please update the baseline as well in any pull requests. 
+Note: for OS X and Unix users, [Mono 4.2](http://www.mono-project.com/download/alpha/) is required.
 
-For common changes, it is sufficient to change the json files. 
-There are three json files that are used to alter the file generation: `addedTypes.json`, `overridingTypes.json` and `removedTypes.json`.
-The format of each file can be inferred from their existing content. 
+## Contribution Guidelines
+
+The `dom.generated.d.ts` and `webworker.generated.d.ts` files in the TypeScript repo are used as baselines.
+For each pull request, we will run the script and compare the generated files with the baseline files.
+In order to make the tests pass, please update the baseline as well in any pull requests.
+
+For common changes, it is sufficient to change the json files.
+There are three json files that are used to alter the file generation: `addedTypes.json`, `overridingTypes.json`, and `removedTypes.json`.
+The format of each file can be inferred from their existing content.
 
 The common steps to send a pull request are:
-  0. Open or refer to an issue in the [TypeScript repo](https://github.com/Microsoft/TypeScript).
-  1. Add missing elements to `inputfiles/addedTypes.json`, overriding elements to `inputfiles/overridingTypes.json`, or  elements to remove to `inputfiles/removedTypes.json`.
-  2. Run the script locally to obtain new `dom.generated.d.ts` and `webworker.generated.d.ts`. 
-  3. Update the files in the `baselines` folder using the newly generated files.
+
+0. Open or refer to an issue in the [TypeScript repo](https://github.com/Microsoft/TypeScript).
+1. Add missing elements to `inputfiles/addedTypes.json`, overriding elements to `inputfiles/overridingTypes.json`, or elements to remove to `inputfiles/removedTypes.json`.
+2. Run the script locally to obtain new `dom.generated.d.ts` and `webworker.generated.d.ts`.
+3. Update the files in the `baselines` folder using the newly generated files.
 
 ## Code Structure
-- `Shared.fs`: handles the parsing from XML spec file, and stores the common data structures for later use;
-- `TS.fs`: handles the emitting of the `lib.d.ts` file;
+
+- `Shared.fs`: handles the parsing from XML spec file, and stores the common data structures for later use.
+- `TS.fs`: handles the emitting of the `lib.d.ts` file.
 - `JS.fs`: handles the emitting of the `domWeb.js` and `domWindows.js`
 
-## Input Files:
-- `browser.webidl.xml`: the XML spec file generated by Microsoft Edge (due to the different updating schedules between Edge and TypeScript, this may **not** be the most up-to-date version of the spec.);
-- `webworker.webidl.xml`: contains additional types for webworker.
+## Input Files
+
+- `browser.webidl.xml`: an XML spec file generated by Microsoft Edge. **Do not edit this file**.
+    - Due to the different update schedules between Edge and TypeScript, this may not be the most up-to-date version of the spec.
+- `webworker.webidl.xml`: an XML spec file generated by Microsoft Edge that contains types for Web Workers. **Do not edit this file**.
 - `addedTypes.json`: types that should exist in either browser or webworker but are missing from the Edge spec. The type can be `property`, `method`, `interface`, `constructor`, or `indexer`.
 - `overridingTypes.json`: types that are defined in the spec file but has a better or more up-to-date definitions in the json files.
 - `removedTypes.json`: types that are defined in the spec file but should be removed.
 - `comments.json`: comment strings to be embedded in the generated .js files
-- `jsTemplate.js`: the initial templates for `domWeb.js` and `domWindows.js`, which contains the necessary helper functions;
+- `jsTemplate.js`: the initial templates for `domWeb.js` and `domWindows.js`, which contains the necessary helper functions.
 - `sample.json`: sample json file used to tell F# json type provider that structure of the json files. The content of it is not used anywhere.