Update label and description for plus code input in new event template

Author: SableRaf

.github/ISSUE_TEMPLATE/new-event.yml

@@ -36,8 +36,8 @@ body:
   - type: input
     id: plus_code
     attributes:
-      label: Plus code in the format XXXXXXXX+XX
-      description: Required for map placement (also for online events). Find or verify the plus code for your event location at https://plus.codes.
+      label: Map placement (plus code)
+      description: Find or verify the plus code for your event location at https://plus.codes.
       placeholder: 9F4MFCCM+JF
     validations:
       required: true