Update building-a-contact-form.md (#19570)
Update building-a-contact-form.md (#19570)

* Update building-a-contact-form.md

Added Getform as a contact form handling solutions

* Update docs/docs/building-a-contact-form.md

better Link Text suggestion added

Co-Authored-By: Michael <184316+muescha@users.noreply.github.com>

* Update building-a-contact-form.md

Revisions suggested have been added.

* Update building-a-contact-form.md

Added some more language to make it clearer.

* Update building-a-contact-form.md

Added some language to make the texts more descriptive.

* Update building-a-contact-form.md

Language changes.

* formatted

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