[R-package] [docs] fix warnings in pkgdown site building (#3086)

* [R-package] [docs] fix warnings in pkgdown sitte  building

* trying to get better Travis logs

* trying to get better Travis logs

* undo testing fix

* undo testing fix

* empty commit

.gitignore

@@ -397,6 +397,7 @@ python-package/compile/
 python-package/lightgbm/VERSION.txt
 
 # R build artefacts
+R-package/docs
 R-package/src/CMakeLists.txt
 R-package/src/lib_lightgbm.so.dSYM/
 R-package/src/src/

R-package/R/lightgbm.R

@@ -15,6 +15,7 @@
 #' @param nrounds number of training rounds
 #' @param params List of parameters
 #' @param verbose verbosity for output, if <= 0, also will disable the print of evaluation during training
+#' @keywords internal
 NULL
 
 #' @name lightgbm

R-package/man/lgb_shared_params.Rd

@@ -29,3 +29,4 @@ If early stopping occurs, the model will have 'best_iter' field.}
 \description{
 Parameter docs shared by \code{lgb.train}, \code{lgb.cv}, and \code{lightgbm}
 }
+\keyword{internal}

R-package/pkgdown/_pkgdown.yml

@@ -72,6 +72,7 @@ reference:
     - '`lgb.prepare2`'
     - '`lgb.prepare_rules`'
     - '`lgb.prepare_rules2`'
+    - '`lightgbm`'
     - '`lgb.train`'
     - '`lgb.cv`'
   - title: Saving / Loading Models