blake2s, blake2b: fix typo in new_digest description (#23531)

Author: kimshrier

vlib/crypto/blake2b/blake2b.v

@@ -145,7 +145,7 @@ fn (err InputBufferSizeError) msg() string {
 // new_digest creates an initialized digest structure based on
 // the hash size and whether or not you specify a MAC key.
 //
-// hash_size - the number if bytes in the generated hash.
+// hash_size - the number of bytes in the generated hash.
 //     Legal values are between 1 and 64.
 //
 // key - key used for generating a prefix MAC.  A zero length

vlib/crypto/blake2s/blake2s.v

@@ -144,7 +144,7 @@ fn (err InputBufferSizeError) msg() string {
 // new_digest creates an initialized digest structure based on
 // the hash size and whether or not you specify a MAC key.
 //
-// hash_size - the number if bytes in the generated hash.
+// hash_size - the number of bytes in the generated hash.
 //     Legal values are between 1 and 32.
 //
 // key - key used for generating a prefix MAC.  A zero length