Update docs for mips target tier demotion.

RELEASES.md

@@ -229,6 +229,7 @@ Compatibility Notes
   this should only impact users of other registries, or people who don't publish
   to a registry.
   [#12291](https://github.com/rust-lang/cargo/pull/12291)
+- [Demoted `mips*-unknown-linux-gnu*` targets from host tier 2 to target tier 3 support.](https://github.com/rust-lang/rust/pull/113274)
 
 Version 1.71.1 (2023-08-03)
 ===========================

src/doc/rustc/src/platform-support.md

@@ -93,10 +93,6 @@ target | notes
 `arm-unknown-linux-gnueabihf` | ARMv6 Linux, hardfloat (kernel 3.2, glibc 2.17)
 `armv7-unknown-linux-gnueabihf` | ARMv7-A Linux, hardfloat (kernel 3.2, glibc 2.17)
 [`loongarch64-unknown-linux-gnu`](platform-support/loongarch-linux.md) | LoongArch64 Linux, LP64D ABI (kernel 5.19, glibc 2.36)
-`mips-unknown-linux-gnu` | MIPS Linux (kernel 4.4, glibc 2.23)
-`mips64-unknown-linux-gnuabi64` | MIPS64 Linux, n64 ABI (kernel 4.4, glibc 2.23)
-`mips64el-unknown-linux-gnuabi64` | MIPS64 (LE) Linux, n64 ABI (kernel 4.4, glibc 2.23)
-`mipsel-unknown-linux-gnu` | MIPS (LE) Linux (kernel 4.4, glibc 2.23)
 `powerpc-unknown-linux-gnu` | PowerPC Linux (kernel 3.2, glibc 2.17)
 `powerpc64-unknown-linux-gnu` | PPC64 Linux (kernel 3.2, glibc 2.17)
 `powerpc64le-unknown-linux-gnu` | PPC64LE Linux (kernel 3.10, glibc 2.17)
@@ -286,6 +282,10 @@ target | std | host | notes
 [`mips64-openwrt-linux-musl`](platform-support/mips64-openwrt-linux-musl.md) | ? |  | MIPS64 for OpenWrt Linux MUSL
 `mipsel-sony-psp` | * |  | MIPS (LE) Sony PlayStation Portable (PSP)
 [`mipsel-sony-psx`](platform-support/mipsel-sony-psx.md) | * |  | MIPS (LE) Sony PlayStation 1 (PSX)
+`mips-unknown-linux-gnu` | MIPS Linux (kernel 4.4, glibc 2.23)
+`mips64-unknown-linux-gnuabi64` | MIPS64 Linux, n64 ABI (kernel 4.4, glibc 2.23)
+`mips64el-unknown-linux-gnuabi64` | MIPS64 (LE) Linux, n64 ABI (kernel 4.4, glibc 2.23)
+`mipsel-unknown-linux-gnu` | MIPS (LE) Linux (kernel 4.4, glibc 2.23)
 `mipsel-unknown-linux-uclibc` | ✓ |  | MIPS (LE) Linux with uClibc
 `mipsel-unknown-none` | * |  | Bare MIPS (LE) softfloat
 [`mipsisa32r6-unknown-linux-gnu`](platform-support/mips-release-6.md) | ? |  | 32-bit MIPS Release 6 Big Endian