Update source-install.md (#5869)

## What are you changing in this pull request and why?
Quick fix on the code

## Checklist
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website/docs/docs/core/source-install.md

@@ -40,8 +40,9 @@ python -m pip install -r requirements.txt
 To install in editable mode, which includes your local changes as you make them:
 
 ```shell
-python -m pip install -e editable-requirements.txt` instead.
+python -m pip install -e editable-requirements.txt` 
 ```
+instead.
 
 ### Installing adapter plugins