Add annotation.args examples to all grouped_ function documentation

[Copilot]

Updates examples for grouped_ functions to demonstrate annotation.args usage, addressing documentation gap where some functions lacked examples of this parameter.

Changes

• R source files updated: ggbetweenstats.R, ggwithinstats.R, ggbarstats.R, ggpiestats.R, ggdotplotstats.R
• Man pages updated: corresponding .Rd files in man/

Example

grouped_ggbetweenstats(
  data = filter(movies_long, genre %in% c("Action", "Comedy"), mpaa %in% c("R", "PG")),
  x = genre,
  y = rating,
  grouping.var = mpaa,
  ggplot.component = scale_y_continuous(breaks = seq(1, 9, 1), limits = c(1, 9)),
  annotation.args = list(title = "Ratings by genre for different MPAA ratings")
)

Functions already covered (unchanged)

• grouped_gghistostats, grouped_ggcorrmat, grouped_ggscatterstats

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Update all examples for grouped_ to show how to use annotation.args argument</issue_title>
<issue_description></issue_description>

<agent_instructions>Also make sure to update man/.Rd files for this change</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Update all examples for grouped_ to show how to use annotation.args argument #1024

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