Merge #11635: trivial: Fix typo – alreardy → already

Summary:
7536b08c1 trivial: Fix typo – alreardy → already (practicalswift)

Pull request description:

Fix typo: alreardy → already.

Tree-SHA512: b53f7540e516bb0a106873983aea8cb35f8e6690153b2c737ede79be7dae7b9e5f644859204ab6419de0f900ffac50bfdd775259b24ad8c12993b4c792fe836b

Backport of Core PR11635

https://github.com/bitcoin/bitcoin/pull/11635/files

Test Plan:
make check
Reverted the change and did arc lint to confirm adding to the dictionary works as expected.

Reviewers: #bitcoin_abc, deadalnix, nakihito

Reviewed By: nakihito

Differential Revision: https://reviews.bitcoinabc.org/D3465