Fix platformtemplate command help message

Signed-off-by: Roberto Rosario <roberto.rosario@mayan-edms.com>

HISTORY.rst

@@ -3,6 +3,7 @@
 - Move IMAPMockServer to its own module.
 - Display feedback message when testing a mailing profile.
 - Add tests to the platform app.
+- Fix platformtemplate command --context option help message.
 
 3.2.8 (2019-10-01)
 ==================

mayan/apps/platform/management/commands/platformtemplate.py

@@ -16,8 +16,8 @@ class Command(management.BaseCommand):
         )
         parser.add_argument(
             '--context', action='store', default='', dest='context',
-            help='Pass a context to the template in the form of a JSON encoded '
-            'dictionary.',
+            help='Pass a context to the template in the form of a YAML '
+            'encoded dictionary.',
         )
 
     def handle(self, *args, **options):