all: fix typos in comments (#21118)

signer/core/signed_data.go

@@ -98,7 +98,7 @@ func (t *Type) isReferenceType() bool {
 	if len(t.Type) == 0 {
 		return false
 	}
-	// Reference types must have a leading uppercase characer
+	// Reference types must have a leading uppercase character
 	return unicode.IsUpper([]rune(t.Type)[0])
 }
 

signer/core/uiapi.go

@@ -109,7 +109,7 @@ func (s *UIServerAPI) DeriveAccount(url string, path string, pin *bool) (account
 	return wallet.Derive(derivPath, *pin)
 }
 
-// fetchKeystore retrives the encrypted keystore from the account manager.
+// fetchKeystore retrieves the encrypted keystore from the account manager.
 func fetchKeystore(am *accounts.Manager) *keystore.KeyStore {
 	return am.Backends(keystore.KeyStoreType)[0].(*keystore.KeyStore)
 }