[R-package] [ci] removed TODOs in code (#2667)

* [R-package] removed TODOs in code

* [ci] added to-do to TODO comment linter

.ci/lint_r_code.R

@@ -34,7 +34,7 @@ LINTERS_TO_USE <- list(
     , "single_quotes" = lintr::single_quotes_linter
     , "spaces_inside" = lintr::spaces_inside_linter
     , "spaces_left_parens" = lintr::spaces_left_parentheses_linter
-    , "todo_comments" = lintr::todo_comment_linter
+    , "todo_comments" = lintr::todo_comment_linter(c("todo", "fixme", "to-do"))
     , "trailing_blank" = lintr::trailing_blank_lines_linter
     , "trailing_white" = lintr::trailing_whitespace_linter
     , "true_false" = lintr::T_and_F_symbol_linter

R-package/R/callback.R

@@ -100,7 +100,6 @@ cb.reset.parameters <- function(new_params) {
       p[i]
     })
 
-    # To-do check pars
     if (!is.null(env$model)) {
       env$model$reset_parameter(pars)
     }

R-package/R/lgb.Predictor.R

@@ -180,7 +180,6 @@ Predictor <- R6::R6Class(
         } else {
 
           # Cannot predict on unknown class
-          # to-do: predict from lgb.Dataset
           stop("predict: cannot predict on data of class ", sQuote(class(data)))
 
         }