docs: remove global profile from contributing

[MikeMcC399]

Issue

CONTRIBUTING > Multi-Architecture Support contains the paragraph:

A current limitation is that no arm64 images have browser binaries - see #695 for details. global-profile.sh is placed in /etc/bash.bashrc, so Arm Docker users will see a warning about this limitation.

The second sentence links to https://github.com/cypress-io/cypress-docker-images/blob/master/scripts/for-images/global-profile.sh and produces a "404 -page not found" error.

• PR Introduce the cypress/factory image #812 removed the file scripts/for-images/global-profile.sh and the description referring to this file is obsolete.

Change

Remove the second sentence (below) in the above paragraph from CONTRIBUTING > Multi-Architecture Support:

global-profile.sh is placed in /etc/bash.bashrc, so Arm Docker users will see a warning about this limitation.

[cypress-app-bot]

• Create a Draft Pull Request if your PR is not ready for review. Mark the PR as Ready for Review when you're ready for a Cypress team member to review the PR.