[lld] Convert CODE_OWNERS.txt to Maintainers.md (#118084)

To align with https://llvm.org/docs/DeveloperPolicy.html#maintainers

I've moved the file and changed it to markdown to match `llvm/`'s file.

lld/CODE_OWNERS.TXT

@@ -1,26 +0,0 @@
-This file is a list of the people responsible for ensuring that patches for a
-particular part of LLD are reviewed, either by themself or by someone else.
-They are also the gatekeepers for their part of LLD, with the final word on
-what goes in or not.
-
-The list is sorted by surname and formatted to allow easy grepping and
-beautification by scripts.  The fields are: name (N), email (E), web-address
-(W), PGP key ID and fingerprint (P), description (D), and snail-mail address
-(S). Each entry should contain at least the (N), (E) and (D) fields.
-
-
-N: Rui Ueyama
-E: ruiu@google.com
-D: COFF, ELF backends (COFF/* ELF/*)
-
-N: Lang Hames, Nick Kledzik
-E: lhames@gmail.com, kledzik@apple.com
-D: Old Mach-O backend
-
-N: Sam Clegg
-E: sbc@chromium.org
-D: WebAssembly backend (wasm/*)
-
-N: Jez Ng, Greg McGary, Shoaib Meenai
-E: jezng@fb.com, gkm@fb.com, smeenai@fb.com
-D: New Mach-O backend

lld/Maintainers.md

@@ -0,0 +1,40 @@
+# LLD Maintainers
+
+This file is a list of the
+[maintainers](https://llvm.org/docs/DeveloperPolicy.html#maintainers) for
+LLD.
+
+## Current Maintainers
+
+The following people are the active maintainers for the project. Please reach
+out to them for code reviews, questions about their area of expertise, or other
+assistance.
+
+### COFF, ELF backends (COFF/* ELF/*)
+
+Rui Ueyama \
+ruiu@google.com (email)
+
+### Old Mach-O backend
+
+Lang Hames \
+lhames@gmail.com (email)
+
+Nick Kledzik \
+kledzik@apple.com (email)
+
+### WebAssembly backend (wasm/*)
+
+Sam Clegg \
+sbc@chromium.org (email)
+
+### New Mach-O backend
+
+Jez Ng \
+jezng@fb.com (email)
+
+Greg McGary \
+gkm@fb.com (email)
+
+Shoaib Meenai \
+smeenai@fb.com (email)

llvm/Maintainers.md

@@ -434,7 +434,7 @@ Others only have a lead maintainer listed here.
 
 [Flang maintainers](https://github.com/llvm/llvm-project/blob/main/flang/Maintainers.txt)
 
-[LLD maintainers](https://github.com/llvm/llvm-project/blob/main/lld/CODE_OWNERS.TXT)
+[LLD maintainers](https://github.com/llvm/llvm-project/blob/main/lld/Maintainers.md)
 
 [LLDB maintainers](https://github.com/llvm/llvm-project/blob/main/lldb/Maintainers.rst)