docs: document the discard draft function properly

frontend/src/email/EmailForm/useFormState.ts

@@ -184,6 +184,11 @@ const useFormState = ({
       })
   }
 
+  /**
+   * Resets the form state to the initial state. If the form was loaded from
+   * a draft, the draft will be discarded
+   * (currently, that means updating its values to the initial values).
+   */
   const discardDraft = (notifyOnSuccess: boolean) => {
     setSenderAddress(teamAddress || '')
     setContent('')
@@ -195,6 +200,7 @@ const useFormState = ({
     setTemplate(undefined)
 
     if (!loadDraft) {
+      notify('Draft discarded')
       return
     }