docs: add missing Dart examples (supabase#39815)

Author: Guilherme Souza

apps/docs/content/guides/auth/passwords.mdx

@@ -643,6 +643,18 @@ client.auth.reset_password_email(
 )
 ```
 
+</TabPanel>
+</$Show>
+<$Show if="sdk:dart">
+<TabPanel id="dart" label="Dart">
+
+```dart
+await supabase.auth.resetPasswordForEmail(
+  '[email protected]',
+  redirectTo: 'http://example.com/account/update-password',
+);
+```
+
 </TabPanel>
 </$Show>
 </Tabs>
@@ -937,6 +949,15 @@ supabase.gotrue.sendRecoveryEmail(
 supabase.auth.reset_password_email('[email protected]')
 ```
 
+</TabPanel>
+</$Show>
+<$Show if="sdk:dart">
+<TabPanel id="dart" label="Dart">
+
+```dart
+await supabase.auth.resetPasswordForEmail('[email protected]');
+```
+
 </TabPanel>
 </$Show>
 </Tabs>
@@ -992,6 +1013,17 @@ supabase.auth.updateUser {
 supabase.auth.update_user({'password': 'new_password'})
 ```
 
+</TabPanel>
+</$Show>
+<$Show if="sdk:dart">
+<TabPanel id="dart" label="Dart">
+
+```dart
+final UserResponse res = await supabase.auth.updateUser(
+  UserAttributes(password: 'new_password'),
+);
+```
+
 </TabPanel>
 </$Show>
 </Tabs>
@@ -1098,6 +1130,18 @@ supabase.auth.sign_up({
 })
 ```
 
+</TabPanel>
+</$Show>
+<$Show if="sdk:dart">
+<TabPanel id="dart" label="Dart">
+
+```dart
+final AuthResponse res = await supabase.auth.signUp(
+  phone: '+13334445555',
+  password: 'some-password',
+);
+```
+
 </TabPanel>
 </$Show>
 <TabPanel id="http" label="HTTP">
@@ -1187,6 +1231,21 @@ supabase.auth.verify_otp({
 })
 ```
 
+</TabPanel>
+</$Show>
+<$Show if="sdk:dart">
+<TabPanel id="dart" label="Dart">
+
+You should present a form to the user so they can input the 6 digit pin, then send it along with the phone number to `verifyOTP`:
+
+```dart
+final AuthResponse res = await supabase.auth.verifyOTP(
+  phone: '+13334445555',
+  token: '123456',
+  type: OtpType.sms,
+);
+```
+
 </TabPanel>
 </$Show>
 <TabPanel id="http" label="HTTP">
@@ -1259,11 +1318,23 @@ supabase.auth.signInWith(Phone) {
 
 ```python
 supabase.auth.sign_in_with_password({
-  'phone': "+13334445555"
+  'phone': "+13334445555",
   'password': "some-password"
 })
 ```
 
+</TabPanel>
+</$Show>
+<$Show if="sdk:dart">
+<TabPanel id="dart" label="Dart">
+
+```dart
+final AuthResponse res = await supabase.auth.signInWithPassword(
+  phone: '+13334445555',
+  password: 'some-password',
+);
+```
+
 </TabPanel>
 </$Show>
 <TabPanel id="http" label="HTTP">