Adds summary table for extended syntax

Author	DaveJarvis <email>
Date	2025-09-05 14:02:18 GMT-0700
Commit	47cfde276c1c919584b647854455bce0817d6261
Parent	25b3f27
Delta	21 lines added, 3 lines removed, 18-line increase

docs/07-advanced-markdown.md

		typography.

		+## Summary
		+
		+[@tbl:markdown-extended-syntax] summarizes the syntaxes described in this
		+chapter.
		+
		+\| Syntax \| Meaning \| Marks \|
		+\|------------------------\|---------------------------------------------------\|
		+\| `::: name` ¶ `:::` \| Fenced div \| Triple colons \|
		+\| ` ``` name` ¶ ` ``` ` \| Code block \| Triple backticks \|
		+\| `[word]{.class}` \| Inline class \| Brackets and braces \|
		+\| `{#type:id}` \| Cross-reference definition \| Braces and hash \|
		+\| `[@type:id]` \| Cross-reference anchor link \| Brackets and at \|
		+
		+:: Extended syntax {#tbl:markdown-extended-syntax}
		+
		+Note that the pilcrow (`¶`) means that the opener is separated from its closer
		+by one or more blank lines (i.e., paragraphs).
		+

docs/12-r.md

		This is because the application inserts variable reference names based on the
		type of file being edited. By default, the R engine does not have a function
		-named `x` defined. The `x` function is a fail-safe string conversion function.
		+named `x` defined. The `x` function performs fail-safe string conversions.

		Continue as follows:

		```

		-By isolating the data to an external file, it is possible to replenish
		-the file and rebuild the document to insert the latest values.
		+By isolating the data to an external file, it is possible to update the file
		+and rebuild the document to insert the latest values.

docs/user-manual.pdf

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