docs: clarify tibble zero-row recycling#1694
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Fixes #1569.
Summary
tibble()recycling rules more visible in?tibble.rowsworkaround for placeholder nested tibblesChecks
Rscript -e 'tools::checkRd("man/tibble.Rd")'\n-git diff --check\n-Rscript -e 'library(tibble); z <- tibble(a = 1, b = tibble()); one <- tibble(a = 1, b = tibble(.rows = 1)); stopifnot(nrow(z) == 0L, nrow(one) == 1L)'\n-R CMD build --no-build-vignettes .\n\nI did not rundevtools::document()becausedevtools/roxygen2are not installed on this local machine; the generated Rd file is updated in the same commit.