[e.cash] Fix typo and remove redundancy on CORE-TECH

Summary: Change "Tranfer" to "Transfer" and slightly different wording for better flow in subnets section

Test Plan: visit e.cash/core-tech scroll down to subnets

Reviewers: #bitcoin_abc, bytesofman

Reviewed By: #bitcoin_abc, bytesofman

Subscribers: bytesofman

Differential Revision: https://reviews.bitcoinabc.org/D16970