[ELF][docs] Update supported targets

PowerPC, PowerPC64 and x86-32 have production quality.
Mention Hexagon, RISC-V and SPARC V9.

lld/docs/index.rst

@@ -33,10 +33,10 @@ Features
   machine, you can expect that LLD runs more than twice as fast as the GNU
   gold linker. Your mileage may vary, though.
 
-- It supports various CPUs/ABIs including x86-64, x86, x32, AArch64,
-  ARM, MIPS 32/64 big/little-endian, PowerPC, PowerPC 64 and AMDGPU.
-  Among these, x86-64, AArch64, and ARM (>= v6) are production quality.
-  MIPS seems decent too. x86 should be OK but is not well tested yet.
+- It supports various CPUs/ABIs including AArch64, AMDGPU, ARM, Hexagon, MIPS
+  32/64 big/little-endian, PowerPC, PowerPC64, RISC-V, SPARC V9, x86-32 and
+  x86-64. Among these, AArch64, ARM (>= v6), PowerPC, PowerPC64, x86-32 and
+  x86-64 have production quality. MIPS seems decent too.
 
 - It is always a cross-linker, meaning that it always supports all the
   above targets however it was built. In fact, we don't provide a