Matrix token command hint should send JSON (#5990)

Co-authored-by: Otto Richter <otto@codeberg.org>

src/components/notifications/Matrix.vue

@@ -18,7 +18,7 @@
             {{ $t("matrixDesc1") }}
         </p>
         <i18n-t tag="p" keypath="matrixDesc2" style="margin-top: 8px;">
-            <code>curl -XPOST -d '{"type": "m.login.password", "identifier": {"user": "botusername", "type": "m.id.user"}, "password": "passwordforuser"}' "https://home.server/_matrix/client/v3/login"</code>.
+            <code>curl -XPOST --json '{"type": "m.login.password", "identifier": {"user": "botusername", "type": "m.id.user"}, "password": "passwordforuser"}' "https://home.server/_matrix/client/v3/login"</code>.
         </i18n-t>
     </div>
 </template>