docs: state the validation status and correct claims the material contradicts

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docs/man/gasm-asm.1

@@ -20,13 +20,24 @@ flag selects what is written:
 self-consistent image;
 .B elf
 emits a relocatable object (.text/.data sections, a symbol table and
-one PC32 relocation per static-symbol reference) that links with the
+one relocation per static-symbol reference, in the architecture's own
+form: R_X86_64_PC32 on amd64, R_AARCH64_*, R_RISCV_* or R_LARCH_* on the
+others) that links with the
 system toolchain;
 .B goobj
 emits the Go toolchain's own object format, which cmd/link consumes
 directly (it requires
 .BR \-p ,
-the package path, and the installed Go toolchain).
+the package path, and the installed Go toolchain: the object preamble is
+captured from
+.B go tool asm
+and the format version from
+.BR "go version" ).
+.PP
+.B raw
+and
+.B elf
+need no toolchain at all.
 .PP
 Framed functions receive the stack-split guard and the trailing
 morestack block, byte-identical to the toolchain's output, so split
@@ -51,10 +62,10 @@ Exits 0 on success, 1 when parsing or assembly fails, and 2 on a usage
 error.
 .SH EXAMPLES
 .nf
-gasm asm \-o hello.bin hello_amd64.s               raw image
-gasm asm \-\-format elf \-o k.o k.s                 linkable ELF object
-gasm asm \-\-format goobj \-p pkg/path \-o k.o k.s   Go object for go build
-gasm asm \-GOARCH amd64 cpu_x86.s                  arch override
+gasm asm \-o hello.bin hello_amd64.s                      raw image
+gasm asm \-\-format elf \-o k.o k_amd64.s                  linkable ELF object
+gasm asm \-\-format goobj \-p pkg/path \-o k.o k_amd64.s   Go object for go build
+gasm asm \-GOARCH amd64 cpu_x86.s                         arch override
 .fi
 .SH SEE ALSO
 .BR gasm (1),