docs: Refine explanation of callouts in Live Preview (#998)

This essentially copies in @AnnaKornfeldSimpson text
from the popup warning about issues with completing
tasks that are in callouts when in Live Preview mode.

It also breaks up a long-ish paragraph a bit.

Author: claremacrae

docs/getting-started/index.md

@@ -81,8 +81,15 @@ The following _does not work:_
 Warning
 {: .label .label-yellow}
 Tasks can read tasks that are inside blockquotes or [Obsidian's built-in callouts](https://help.obsidian.md/How+to/Use+callouts).
-However, in the Live Preview editor mode (pencil icon in lower right corner), tasks written inside callouts cannot be completed by clicking the checkbox.
-You will see a warning; use the command `Tasks: Toggle Done`, or switch to Reading View (book icon in lower right corner) to click the checkbox.
+
+However, under the following very specific circumstance, Tasks cannot add or remove completion dates or make the next copy of a recurring task:
+
+- Obsidian is in Live Preview editor mode (pencil icon in lower right corner),
+- AND the task's markdown is in a callout,
+- AND the user clicked on the task's checkbox to complete or re-open the task.
+
+If you toggle a task's status in this situation, you will see a warning. Use the command `Tasks: Toggle Done`, or switch to Reading View (book icon in lower right corner) to click the checkbox.
+
 Completing a task by clicking its checkbox from a `tasks` query block _will_ work in any editor mode, even if the query is inside a callout.
 
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