Update the documentation and RSpec tests to reflect the new default value of 100

Ed Torresrequested to merge
gitlab-community/gitlab-org/gitlab:382576-increase-default-max-attachment-size into master

What does this MR do and why?

This MR updates the documentation and RSpec tests to reflect the new default value of 100 (MB) for the global application setting max_attachment_size.

References

This MR supports: #382576

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Before After

How to set up and validate locally

  1. In the gdk, go to the gitlab repository and run the following tests:
bundle exec rspec spec/lib/file_size_validator_spec.rb
bundle exec rspec spec/models/instance_configuration_spec.rb

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Related to #382576

Edited by Ed Torres

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