fix typo

Author: omahs

bip-0390.mediawiki

@@ -51,7 +51,7 @@ backed up, or guess, the correct order of keys.</ref>.
 <tt>musig(KEY, KEY, ..., KEY)/NUM/.../*</tt> expressions are also allowed, with the same usage
 restrictions as in the previous section. The aggregate public key
 is first computed as described above, with the keys also being sorted after all derivation and prior
-to aggreation. Then further BIP 32 derivation will be performed on the aggregate public key as described in
+to aggregation. Then further BIP 32 derivation will be performed on the aggregate public key as described in
 [[bip-0328.mediawiki|BIP 328]]. As there is no aggregate private key,
 only unhardened derivation from the aggregate public key is allowed, and thus the derivation steps
 following the <tt>musig()</tt> expression cannot contain