ffd11ea876 Fix typo and grammar (Heebs)
Pull request description:
Fix typo and grammar in the coin selection algorithm's description.
ACKs for top commit:
meshcollider:
ACK ffd11ea876
Tree-SHA512: bba07c2efd5140fb3e021618739d70aaa761bbc274afb8158809492b0606773c217e42e58e58b18a2454b9c45ebc883ebece17cdc467ac60e3d3140d7a979db7