[e.cash] Fix overflow issue on /upgrade page

Summary:
If you visit e.cash/upgrade on mobile you can see there is some horizontal scroll coming from one of the code blocks overflowing.
Adding break-all class to all the code blocks to prevent this

Test Plan: preview and check

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D18778