Incomplete sentence in installation documentation

[Musubee]

Describe the bug
A clear and concise description of what the bug is.

There is an incomplete sentence in the installation docs under the "Clone the ML-Agents Toolkit Repository (Optional)" section:
"The --branch release_14 option will switch to the tag of the latest stable release. Omitting that will get the main branch which is potentially"

I plan to submit a PR to change the Installation.md file, so that the above sentence reads "... which is potentially unstable."

To Reproduce
Steps to reproduce the behavior:

1. Go to docs/Installation.md
2. The sentence can be found in the second paragraph of the "Clone the ML-Agents Toolkit Repository (Optional)" section.

Console logs / stack traces
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Screenshots
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Environment (please complete the following information):

• Unity Version: [e.g. Unity 2020.1f1]
• OS + version: [e.g. Windows 10]
• ML-Agents version: (e.g. ML-Agents v0.8, or latest develop branch from source)
• Torch version: (you can run pip3 show torch to get this)
• Environment: (which example environment you used to reproduce the error)
  N/A

NOTE: We are unable to help reproduce bugs with custom environments. Please attempt to reproduce your issue with one of the example environments, or provide a minimal patch to one of the environments needed to reproduce the issue.

[surfnerd]

Whoops, that's my fault. If you want to submit a PR please do and assign me to it.

[surfnerd]

Merged in #5078

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