alpha.c, [...]: Fix comment typos.

alpha.c, [...]: Fix comment typos.

	* config/alpha/alpha.c, config/arc/arc.c,
	config/arm/arm-cores.def, config/arm/arm.c, config/arm/arm.h,
	config/arm/arm1026ejs.md, config/arm/arm1136jfs.md,
	config/arm/arm926ejs.md, config/arm/vfp.md, config/avr/avr.c,
	config/c4x/c4x.c, config/cris/cris.c, config/frv/frv.md,
	config/i386/i386.c, config/i386/i386.h, config/i386/i386.md,
	config/ia64/ia64.c, config/ia64/unwind-ia64.c,
	config/iq2000/iq2000.c, config/m32r/m32r.c,
	config/mips/mips.c, config/mmix/mmix.c, config/mmix/mmix.h,
	config/ns32k/ns32k.c, config/pa/pa.c, config/pdp11/pdp11.c,
	config/rs6000/darwin-ldouble.c, config/rs6000/rs6000.c,
	config/rs6000/rs6000.h, config/sparc/sparc.c,
	config/vax/vax.c: Fix comment typos.  Follow spelling
	conventions.

From-SVN: r77267