doc: add prerequisite for browser mode (#4455)

* doc: add prerequisite for browser mode

Signed-off-by: nkomonen <[email protected]>

* Update docs/browser.md

---------

Signed-off-by: nkomonen <[email protected]>
Co-authored-by: Justin M. Keyes <[email protected]>

Author: nkomonen-amazon

CONTRIBUTING.md

@@ -28,6 +28,7 @@ To develop this project, install these dependencies:
 -   [Git](https://git-scm.com/downloads)
     -   (optional) Set `git blame` to ignore noise-commits: `git config blame.ignoreRevsFile .git-blame-ignore-revs`
 -   [AWS `git secrets`](https://github.com/awslabs/git-secrets)
+-   (required for Web mode) [TypeScript + Webpack Problem Matcher](https://marketplace.visualstudio.com/items?itemName=amodio.tsl-problem-matcher)
 -   (optional) [AWS SAM CLI](https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-sam-cli-install.html)
 -   (optional) [Docker](https://docs.docker.com/get-docker/)
 

docs/browser.md

@@ -7,6 +7,10 @@ the desktop version.
 
 You can run the browser implementation of the extension in the following ways.
 
+## Pre-requisites
+
+[See the CONTRIBUTING document.](../CONTRIBUTING.md#setup)
+
 ### General Notes
 
 -   To see logs, using the Command Palette search: `Toggle Developer Tools`. Then go to the `Console` tab. In browser mode VS Code seems to duplicate log messages, idk how to fix this.
@@ -70,7 +74,7 @@ VS Code window, in the background it is running in a Browser context.
 
 ## Finding incompatible transitive dependencies
 
-For example, if I have a Typescript module, `myFile.ts`, that imports a module, which imports another module (transitive dependency) such as `fs-extra`,
+For example, if I have a Typescript module, `myFile.ts`, that imports a module which imports another module (transitive dependency) such as `fs-extra`,
 when I execute `myFile.ts` in the browser it will break due to `fs-extra` not being browser compatible.
 
 It may be difficult to determine which module imported `fs-extra` due to a nested chain of transitive dependencies.