linting: fix mustache

templates/paymentoptions.mustache

@@ -1,3 +1,41 @@
+{{!
+    This file is part of Moodle - http://moodle.org/
+
+    Moodle is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    Moodle is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+}}
+{{!
+    @template paygw_unigraz/paymentoptions
+
+    Classes required for JS:
+    * none
+
+    Data attributes required for JS:
+    * none
+
+    Context variables required for this template:
+    * none
+
+    Example context (json):
+    "listofproviders": {
+        "component": "unigraz",
+        "paymentarea": "main",
+        "itemid": "1",
+        "id": "dsafsadf353cbcbDSFDS423",
+        "cartid": "1233534642534"
+    }
+
+}}
 <div>
     <div class="row">
        <div class="col">