Update supported platforms doc

Author: kulikjak

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

@@ -133,7 +133,7 @@ target | std | host | notes
 `x86_64-fortanix-unknown-sgx` | ✓ |  | [Fortanix ABI] for 64-bit Intel SGX
 `x86_64-fuchsia` | ✓ |  | 64-bit Fuchsia
 `x86_64-linux-android` | ✓ |  | 64-bit x86 Android
-`x86_64-sun-solaris` | ✓ |  | 64-bit Solaris 10/11, illumos
+`x86_64-pc-solaris` | ✓ |  | 64-bit Solaris 10/11, illumos
 `x86_64-unknown-freebsd` | ✓ | ✓ | 64-bit FreeBSD
 `x86_64-unknown-illumos` | ✓ | ✓ | illumos
 `x86_64-unknown-linux-gnux32` | ✓ |  | 64-bit Linux (x32 ABI) (kernel 4.15, glibc 2.27)
@@ -218,7 +218,7 @@ target | std | host | notes
 `x86_64-apple-ios-macabi` | ✓ |  | Apple Catalyst on x86_64
 `x86_64-apple-tvos` | * | | x86 64-bit tvOS
 `x86_64-linux-kernel` | * |  | Linux kernel modules
-`x86_64-pc-solaris` | ? |  |
+`x86_64-sun-solaris` | ? |  | Deprecated target for 64-bit Solaris 10/11, illumos
 `x86_64-pc-windows-msvc` | ✓ |  | 64-bit Windows XP support
 `x86_64-unknown-dragonfly` | ✓ | ✓ | 64-bit DragonFlyBSD
 `x86_64-unknown-haiku` | ✓ | ✓ | 64-bit Haiku