Fix LFX Crowdfunding name in FUNDING file description

[GeorgLink]

The Linux Foundation Community Bridge became LFX Crowdfunding. LFX Mentorship is more like Google Summer of Code.

Why: Correct the service name

Closes: #39525

What's being changed (if available, include any code snippets, screenshots, or gifs):

Change name "LFX Mentorship" to "LFX Crowdfunding" and update the link

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Table of review links

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Source	Review	Production	What Changed
repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/displaying-a-sponsor-button-in-your-repository.md	fpt ghec	fpt ghec

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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