code: @NotNull
      @ObjectiveCName("editGroupTitleWithGid:withTitle:")
      public Promise<Void> editGroupTitle(final int gid, final String title) {
          return modules.getGroupsModule().editTitle(gid, title);
      }
docs: Edit group's title
  
  @param gid   group's id
  @param title new group title
  @return Promise for void