fix singular/plural ambiguity

bip-taproot.mediawiki

@@ -114,7 +114,7 @@ The following use of <code>hash_type</code> are invalid, and fail execution:
 As the message for signature verification, transaction digest is ''hash<sub>TapSighash</sub>'' of the following values (size in byte) serialized. Numerical values in 2, 4, or 8-byte are encoded in little-endian.
 
 * Control:
-** <code>epoch</code> (1): always 0. <ref>'''What's the purpose of the epoch?''' The <code>epoch</code> can be increased to allow securely creating a new transaction digest algorithm with large changes to the structure or interpretation of <code>hash_type</code> if needed.</ref>
+** <code>epoch</code> (1): always 0. <ref>'''What's the purpose of the epoch?''' The <code>epoch</code> can be increased to allow securely creating new transaction digest algorithms with large changes to the structure or interpretation of <code>hash_type</code> if needed.</ref>
 ** <code>hash_type</code> (1).
 * Transaction data:
 ** <code>nVersion</code> (4): the <code>nVersion</code> of the transaction.