Edited ch08_signatures.adoc with Atlas code editor

ch08_signatures.adoc

@@ -351,7 +351,7 @@ At some later time, Bob wants Alice to identify herself by proving
 that she knows the scalar +x+ for the public key (+xG+) that Bob
 received earlier.  Alice can't give Bob +x+ directly because that would
 allow him to identify as her to other people, so she needs to prove
-her knowledge of +x+ without revealing +x+ to Bob, called a
+her knowledge of +x+ without revealing +x+ to Bob,((("zero-knowledge proof"))) called a
 _zero-knowledge proof_.  For that, we begin the schnorr identity
 process: