fix(settings-mail): Clarify that encryption settings are about transport

As mail encryption might also mean S/MIME or PGP encryption, which
we might add at some point as the underlaying framework already support
it.

Signed-off-by: Carl Schwan <carl@carlschwan.eu>

Author: CarlSchwan

apps/settings/src/views/AdminSettingsMailServer.vue

@@ -152,7 +152,7 @@ async function onSubmit() {
 				<NcSelect
 					v-if="smtpMode?.id === 'smtp'"
 					v-model="smtpEncryption"
-					:input-label="t('settings', 'Encryption')"
+					:input-label="t('settings', 'Transport Encryption')"
 					:options="settingsAdminMail.smtpEncryptionOptions"
 					required />
 				<NcSelect