[DOC]: Yarn package install in getting-started.md (#2566)

Because yarn is installed with add, not install, �I changed yarn install
to yarn add.

## Description of changes

*Summarize the changes made by this PR.*
 - Improvements & Bug fixes
	 - fix bug about wrong document
 - New functionality

## Test plan
*How are these changes tested?*
It just update for document 

## Documentation Changes
*Are all docstrings for user-facing APIs updated if required? Do we need
to make documentation changes in the [docs
repository](https://github.com/chroma-core/docs)?*

---------

Co-authored-by: Trayan Azarov <[email protected]>
Co-authored-by: Jeffrey Huber <[email protected]>

docs/docs.trychroma.com/pages/getting-started.md

@@ -30,7 +30,7 @@ pip install chromadb # [!code $]
 {% codetab label="yarn" %}
 
 ```bash {% codetab=true %}
-yarn install chromadb chromadb-default-embed # [!code $]
+yarn add chromadb chromadb-default-embed # [!code $]
 ```
 
 {% /codetab %}