docs(library): update what-is-an-mcp-server (#7162)

* docs(library): update what-is-an-mcp-server

* Update apps/sim/content/library/what-is-an-mcp-server/index.mdx

Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>

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Co-authored-by: Sim Pi Agent <pi@sim.ai>
Co-authored-by: Waleed <walif6@gmail.com>
Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>

Author: 4 people