Minor English tweaks to quick-start.md (#3460)

# Description

Minor mods to English wording in `quick-start.md`

# All Promptflow Contribution checklist:
- [x] **The pull request does not introduce [breaking changes].**
- [x] **CHANGELOG is updated for new features, bug fixes or other
significant changes.**
- [x] **I have read the [contribution guidelines](../CONTRIBUTING.md).**
- [ ] **Create an issue and link to the pull request to get dedicated
review from promptflow team. Learn more: [suggested
workflow](../CONTRIBUTING.md#suggested-workflow).**

## General Guidelines and Best Practices
- [x] Title of the pull request is clear and informative.
- [x] There are a small number of commits, each of which have an
informative message. This means that previously merged commits do not
appear in the history of the PR. For more information on cleaning up the
commits in your PR, [see this
page](https://github.com/Azure/azure-powershell/blob/master/documentation/development-docs/cleaning-up-commits.md).

### Testing Guidelines
- [x] Pull request includes test coverage for the included changes.

docs/how-to-guides/quick-start.md

@@ -1,11 +1,11 @@
 # Quick start
 
-This guide will walk you through the fist step using of prompt flow code-first experience.
+This guide will walk you through the first steps of the prompt flow code-first experience.
 
 **Prerequisite** - To make the most of this tutorial, you'll need:
-- Know how to program with Python :)
+- Python programming knowledge
 
-**Learning Objectives** - Upon completing this tutorial, you should learn how to:
+**Learning Objectives** - Upon completing this tutorial, you should know how to:
 - Setup your python environment to run prompt flow
 - Create a flow using a prompt and python function
 - Test the flow using your favorite experience: CLI, SDK or UI.
@@ -17,7 +17,7 @@ Install promptflow package to start.
 pip install promptflow
 ```
 
-Learn more on ways of [installation](./installation/index.md).
+Learn more about [installation](./installation/index.md).
 
 ## Create your first flow