Backport more fixes for building with makeinfo 5

(This was upstream f0fa19ae808dda08bf1d4aef313201380cfbb7ab)

    PR gas/15212
	* doc/c-arc.texi (ARC Directives): Use @code instead of @bullte
	for table format.
	* doc/c-arm.texi (ARM-Instruction-Set): Likewise.  Also add text
	to the @item directives.
	(ARM-Neon-Alignment): Move to correct place in the document.
	* doc/c-cr16.texi (CR16 Operand Qualifiers): Fix up table
	formatting.
	* doc/c-tic54x.texi (TIC54X-Subsyms): Correct use of
	@smallexample.

Conflicts:
	gas/ChangeLog
	gas/doc/c-arc.texi
	gas/doc/c-cr16.texi
	gas/doc/c-tic54x.texi