[SPARKR][MINOR] Fix LDA doc
## What changes were proposed in this pull request? This PR tries to fix the name of the `SparkDataFrame` used in the example. Also, it gives a reference url of an example data file so that users can play with. ## How was this patch tested? Manual test. Author: Junyang Qian <junyangq@databricks.com> Closes #14853 from junyangq/SPARKR-FixLDADoc.
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@ -994,18 +994,22 @@ setMethod("spark.survreg", signature(data = "SparkDataFrame", formula = "formula
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#' @export
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#' @examples
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#' \dontrun{
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#' text <- read.df("path/to/data", source = "libsvm")
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#' # nolint start
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#' # An example "path/to/file" can be
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#' # paste0(Sys.getenv("SPARK_HOME"), "/data/mllib/sample_lda_libsvm_data.txt")
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#' # nolint end
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#' text <- read.df("path/to/file", source = "libsvm")
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#' model <- spark.lda(data = text, optimizer = "em")
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#'
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#' # get a summary of the model
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#' summary(model)
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#'
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#' # compute posterior probabilities
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#' posterior <- spark.posterior(model, df)
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#' posterior <- spark.posterior(model, text)
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#' showDF(posterior)
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#'
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#' # compute perplexity
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#' perplexity <- spark.perplexity(model, df)
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#' perplexity <- spark.perplexity(model, text)
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#'
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#' # save and load the model
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#' path <- "path/to/model"
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