Update bitcoin-fundamentals-review.asciidoc

Co-authored-by: Mark Erhardt <murch@murch.one>

bitcoin-fundamentals-review.asciidoc

@@ -99,7 +99,7 @@ Fingerprints:: A hash can be used to fingerprint a file or message so that it ca
 
 Integrity Proof:: A fingerprint of a file or message demonstrates its integrity, as the file or message cannot be tampered with or modified in any way without changing the fingerprint. This is often use to ensure software has not been tampered with before installing it on your computer.
 
-Commitment/Non-repudiation:: You can commit to a specific preimage (e.g. a number or message) without revealing it, by publishing its hash. Later, you can reveal the secret and everyone can verify that it is the same thing you committed to earlier because it produces the published hash.
+Commitment/Non-repudiation:: You can commit to a specific pre-image (e.g. a number or message) without revealing it, by publishing its hash. Later, you can reveal the secret and everyone can verify that it is the same thing you committed to earlier because it produces the published hash.
 
 Proof-of-Work/Hash Grinding:: You can use a hash to prove you have done computational work, by showing a non-random pattern in the hash which can only be produced by repeated guesses at a pre-image. For example, the hash of a Bitcoin block header starts with a lot of zero bits. The only way to produce it is by changing a part of the header and hashing it trillions of times until it produces that pattern by chance.