docs: Make note about required packages for visualization (#603)

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

Author: jpsamaroo

docs/src/logging-visualization.md

@@ -18,12 +18,12 @@ converted to a `Val` for dispatch purposes
 (i.e. `render_logs(logs::Dict, :myrenderer)` -> `render_logs(logs, Val{:myrenderer}())`).
 
 Built-in `IO` support exists for:
-- `show_logs(io, logs, :graphviz)` to write a Graphviz dot graph of executed tasks and their dependencies
-- `show_logs(io, logs, :chrome_trace)` to write a task execution timeline in the chrome-trace format (view in [perfetto web UI](https://ui.perfetto.dev/) or `about:tracing` in a chrome-based browser)
+- `show_logs(io, logs, :graphviz)` to write a Graphviz dot graph of executed tasks and their dependencies (requires `GraphViz.jl` to be loaded)
+- `show_logs(io, logs, :chrome_trace)` to write a task execution timeline in the chrome-trace format (view in [perfetto web UI](https://ui.perfetto.dev/) or `about:tracing` in a chrome-based browser) (requires `JSON3.jl` to be loaded)
 
 Built-in rendering support exists for:
-- `render_logs(logs, :graphviz)` to generate a graph diagram of executed tasks and their dependencies
-- `render_logs(logs, :plots_gantt)` to generate a Gantt chart of task execution across all processors
+- `render_logs(logs, :graphviz)` to generate a graph diagram of executed tasks and their dependencies (requires `GraphViz.jl` to be loaded)
+- `render_logs(logs, :plots_gantt)` to generate a Gantt chart of task execution across all processors (requires `Plots.jl` and `DataFrames.jl` to be loaded)
 - `render_logs(logs, :chrome_trace)` to generate a `String` with chrome-trace formatted task execution timeline
 
 The latter (`MultiEventLog`) allows for continuously rendering logs as they're