extend.texi (Function Attributes): Add @cindex entries for all attributes and regularize their format.

2015-03-23  Sandra Loosemore  <sandra@codesourcery.com>

	gcc/
	* doc/extend.texi (Function Attributes): Add @cindex entries
	for all attributes and regularize their format.  Delete text
	about long-obsolete 68HC11 and 68HC12 targets.  Move misplaced
	information about "eightbit_data", "tiny_data", and "model"
	variable attributes to the Variable Attributes section.  Fix
	some obvious typos and copy-editing issues.
	(Variable Attributes, Type Attributes): Likewise add/fix
	@cindex entries for all attributes.

From-SVN: r221614