Fix spelling mistakes and typos in the GAS sources.

Fix spelling mistakes and typos in the GAS sources.

	PR gas/21072
	* asintl.h: Fix spelling mistakes and typos.
	* atof-generic.c: Likewise.
	* bit_fix.h: Likewise.
	* config/atof-ieee.c: Likewise.
	* config/bfin-defs.h: Likewise.
	* config/bfin-parse.y: Likewise.
	* config/obj-coff-seh.h: Likewise.
	* config/obj-coff.c: Likewise.
	* config/obj-evax.c: Likewise.
	* config/obj-macho.c: Likewise.
	* config/rx-parse.y: Likewise.
	* config/tc-aarch64.c: Likewise.
	* config/tc-alpha.c: Likewise.
	* config/tc-arc.c: Likewise.
	* config/tc-arm.c: Likewise.
	* config/tc-avr.c: Likewise.
	* config/tc-bfin.c: Likewise.
	* config/tc-cr16.c: Likewise.
	* config/tc-cris.c: Likewise.
	* config/tc-crx.c: Likewise.
	* config/tc-d10v.c: Likewise.
	* config/tc-d30v.c: Likewise.
	* config/tc-dlx.c: Likewise.
	* config/tc-epiphany.c: Likewise.
	* config/tc-frv.c: Likewise.
	* config/tc-hppa.c: Likewise.
	* config/tc-i370.c: Likewise.
	* config/tc-i386-intel.c: Likewise.
	* config/tc-i386.c: Likewise.
	* config/tc-i960.c: Likewise.
	* config/tc-ia64.c: Likewise.
	* config/tc-m32r.c: Likewise.
	* config/tc-m68hc11.c: Likewise.
	* config/tc-m68k.c: Likewise.
	* config/tc-mcore.c: Likewise.
	* config/tc-mep.c: Likewise.
	* config/tc-mep.h: Likewise.
	* config/tc-metag.c: Likewise.
	* config/tc-microblaze.c: Likewise.
	* config/tc-mips.c: Likewise.
	* config/tc-mmix.c: Likewise.
	* config/tc-mn10200.c: Likewise.
	* config/tc-mn10300.c: Likewise.
	* config/tc-msp430.c: Likewise.
	* config/tc-msp430.h: Likewise.
	* config/tc-nds32.c: Likewise.
	* config/tc-nds32.h: Likewise.
	* config/tc-nios2.c: Likewise.
	* config/tc-nios2.h: Likewise.
	* config/tc-ns32k.c: Likewise.
	* config/tc-pdp11.c: Likewise.
	* config/tc-ppc.c: Likewise.
	* config/tc-pru.c: Likewise.
	* config/tc-rx.c: Likewise.
	* config/tc-s390.c: Likewise.
	* config/tc-score.c: Likewise.
	* config/tc-score7.c: Likewise.
	* config/tc-sh.c: Likewise.
	* config/tc-sh64.c: Likewise.
	* config/tc-sparc.c: Likewise.
	* config/tc-tic4x.c: Likewise.
	* config/tc-tic54x.c: Likewise.
	* config/tc-v850.c: Likewise.
	* config/tc-vax.c: Likewise.
	* config/tc-visium.c: Likewise.
	* config/tc-xgate.c: Likewise.
	* config/tc-xtensa.c: Likewise.
	* config/tc-z80.c: Likewise.
	* config/tc-z8k.c: Likewise.
	* config/te-vms.c: Likewise.
	* config/xtensa-relax.c: Likewise.
	* doc/as.texinfo: Likewise.
	* doc/c-arm.texi: Likewise.
	* doc/c-hppa.texi: Likewise.
	* doc/c-i370.texi: Likewise.
	* doc/c-i386.texi: Likewise.
	* doc/c-m32r.texi: Likewise.
	* doc/c-m68k.texi: Likewise.
	* doc/c-mmix.texi: Likewise.
	* doc/c-msp430.texi: Likewise.
	* doc/c-nds32.texi: Likewise.
	* doc/c-ns32k.texi: Likewise.
	* doc/c-riscv.texi: Likewise.
	* doc/c-rx.texi: Likewise.
	* doc/c-s390.texi: Likewise.
	* doc/c-tic6x.texi: Likewise.
	* doc/c-tilegx.texi: Likewise.
	* doc/c-tilepro.texi: Likewise.
	* doc/c-v850.texi: Likewise.
	* doc/c-xgate.texi: Likewise.
	* doc/c-xtensa.texi: Likewise.
	* dwarf2dbg.c: Likewise.
	* ecoff.c: Likewise.
	* itbl-ops.c: Likewise.
	* listing.c: Likewise.
	* macro.c: Likewise.
	* po/gas.pot: Likewise.
	* read.c: Likewise.
	* struc-symbol.h: Likewise.
	* symbols.h: Likewise.
	* testsuite/gas/arc/relocs-errors.err: Likewise.
	* write.c: Likewise.