docs: update phone auth docs (#33135)

* docs: state that whatsapp is only supported for Twilio

* docs: update format in callout

* docs: include twilio verify

* fixing capitalization

---------

Co-authored-by: Brian B (theOtherBrian1) <brian@supabase.io>

apps/docs/components/AuthSmsProviderConfig/AuthSmsProviderConfig.Warnings.tsx

@@ -5,12 +5,20 @@ const CostWarning = () => (
   <Admonition type="warning">
     <p>
       To keep SMS sending costs under control, make sure you adjust your project&apos;s rate limits
-      and <Link href="/guides/auth/auth-captcha">configure CAPTCHA</Link>. See the{' '}
-      <Link href="/guides/platform/going-into-prod">Production Checklist</Link> to learn more.
+      and{' '}
+      <Link href="/guides/auth/auth-captcha">
+        <u>configure CAPTCHA</u>
+      </Link>
+      . See the{' '}
+      <Link href="/guides/platform/going-into-prod">
+        <u>Production Checklist</u>
+      </Link>{' '}
+      to learn more.
     </p>
+    <br />
     <p>
-      Some countries have special regulations for services that send SMS messages to users, for
-      example, India&apos;s TRAI DLT regulations. Remember to look up and follow the regulations of
+      Some countries have special regulations for services that send SMS messages to users, (e.g
+      India&apos;s TRAI DLT regulations). Remember to look up and follow the regulations of
       countries where you operate.
     </p>
   </Admonition>

apps/docs/content/guides/auth/phone-login.mdx

@@ -3,7 +3,13 @@ title: 'Phone Login'
 description: 'Learn about logging in to your platform using SMS one-time passwords.'
 ---
 
-Phone Login is a method of authentication that allows users to log in to a website or application without using a password. The user authenticates through a one-time code sent via SMS.
+Phone Login is a method of authentication that allows users to log in to a website or application without using a password. The user authenticates through a one-time password (OTP) sent via a channel (SMS or WhatsApp).
+
+<Admonition type="info">
+
+At this time, `WhatsApp` is only supported as a channel for the Twilio and Twilio Verify Providers.
+
+</Admonition>
 
 Users can also log in with their phones using Native Mobile Login with the built-in identity provider. For Native Mobile Login with Android and iOS, see the [Social Login guides](/docs/guides/auth/social-login).
 

vale/styles/config/vocabularies/Supabase/accept.txt

@@ -105,4 +105,5 @@ VM(s)?
 VSCode
 Vue
 [Ww]eb[Ss]ockets?
+WhatsApp
 Xcode