[Ada] Typo corrections and minor reformatting

[Ada] Typo corrections and minor reformatting

gcc/ada/

	* libgnarl/s-osinte__vxworks.ads: Fix typo ("release" =>
	"releases") plus comment reformatting.
	* libgnat/s-os_lib.ads: In a comment, fix typo ("indended" =>
	"intended"), add a hyphen and semicolon, plus reformatting. In
	comment for subtype time_t, fix typo ("effect" => "affect"), add
	hyphens, plus reformatting.
	* libgnat/s-parame.ads, libgnat/s-parame__ae653.ads,
	libgnat/s-parame__hpux.ads: Remove period from one-line comment.