comment: fix GNU ld and as files

[Thannoy]

comment: fix GNU as comment style (*.s)

As well described by sourceware website [1]: There are two ways of rendering comments to as:

• Anything from /* through the next */ is a comment.
• The line comment character is target specific

We therefore better should use the C style comment instead of any single-line comment which can't fit every cases.

Wikipedia [2] provides a list of target-specific GNU as single-line comments:

• A hash symbol (#) — i386, x86-64, i960, 68HC11, 68HC12, VAX, V850, M32R, PowerPC, MIPS, M680x0, and RISC-V
• A semicolon (;) — AMD 29k family, ARC, H8/300 family, HPPA, PDP-11, picoJava, Motorola, and M32C
• The at sign (@) — 32-bit ARM
• A double slash (//) — AArch64
• A vertical bar (|) — M680x0
• An exclamation mark (!) — Renesas SH

Hash symbol is currently used, this PR make it /* */

comment: fix GNU ld comment style (*.ld)

As per documentation: "You may include comments in linker scripts just as in C: delimited by /* and */."

Link: https://ftp.gnu.org/old-gnu/Manuals/ld-2.9.1/html_chapter/ld_3.html#SEC6

---

• [x] Added a change log entry in changelog.d/<directory>/.
• [x] Added self to copyright blurb of touched files.
• [x] Added self to AUTHORS.rst.
• [ ] Wrote tests. ==> Don't think this desserves a new test
• [ ] Documented my changes in docs/man/ or elsewhere. ==> Don't think this desserves a doc
• [x] My changes do not contradict the current specification.
• [x] I agree to license my contribution under the licenses indicated in the changed files.

[Thannoy]

Ping @monacofj for comments since this PR touches its recent PR #928 work targeting issue #927

[monacofj]

Ping @monacofj for comments since this PR touches its recent PR #928 work targeting issue #927

Thanks @Thannoy for the kind ping. Good call, I think C-style comment for .s files seems more appropriate than the x86-specific character.