* Added panel actions menu content * Formatted text as heading * Added links, formatted bullet list items, and general copy edits * Fixed Vale and Prettier warnings * Remove the word "actions" * Fixed explanation * Updated description of Extensions * Apply suggestion from review Co-authored-by: David Harris <david.harris@grafana.com> * Updated intro text for panel menu * Apply suggestions from code review * Fixed linting issues --------- Co-authored-by: David Harris <david.harris@grafana.com>