Correct Bundle Path in Getting Started Documentation

[OughtPuts]

What was the end-user or developer problem that led to this PR?

doc/GETTING_STARTED.md referenced bundler/bin/bundle, but in this repository the local Bundler wrapper is bin/bundle.

What is your fix for the problem, implemented in this PR?

I updated doc/GETTING_STARTED.md to point to bin/bundle in the local Bundler command example and in the shell alias examples.

I verified the repo layout locally:

• bin/bundle exists and is the wrapper script for running Bundler from this checkout
• bundler/bin/bundle is not present

Make sure the following tasks are checked

• Describe the problem / feature
• Write tests for features and bug fixes
• Write code to solve the problem
• Make sure you follow the current code style and write meaningful commit messages without tags

[hsbt]

👍