Sp-dev-docs: Include instructions to unlink Library

[nanddeepn]

The documentation should also include how to unlink a library from SPFx solution and a symlink from local "node_modules" folder.

---

Document Details

⚠ Do not edit this section. It is required for docs.microsoft.com ➟ GitHub issue linking.

• ID: ac926949-7ab3-3a40-14e8-3b5b032803c1
• Version Independent ID: d3ae1d27-3976-64ac-fda6-5ca18a25dbd0
• Content: Building solutions with the library component type in SharePoint Framework
• Content Source: docs/spfx/library-component-tutorial.md
• Product: sharepoint
• Technology: sharepoint-framework
• GitHub Login: @spdevdocs
• Microsoft Alias: spdevdocs

[msft-github-bot]

Thank you for reporting this issue. We will be triaging your incoming issue as soon as possible.

[andrewconnell]

Sounds like a great PR op for the community :) Care to submit one?

[nanddeepn]

Thanks @andrewconnell
I will submit a PR.

[nanddeepn]

Hi @andrewconnell
Submitted PR https://github.com/SharePoint/sp-dev-docs/pull/4630 for this.
Please review and suggest.
Thank you.

[andrewconnell]

Thanks!

In the future, you don't need to comment that you submitted a PR. If you reference the issue in the PR, you can see GH adds a reference to the PR within the issue.

[msft-github-bot]

Issues that have been closed & had no follow-up activity for at least 7 days are automatically locked. Please refer to our wiki for more details, including how to remediate this action if you feel this was done prematurely or in error: Issue List: Our approach to locked issues