Remove extra columns from promoted targets

Author: qb42

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

@@ -163,10 +163,10 @@ target | std | notes
 `armv7-unknown-linux-musleabi` | ✓ | Armv7-A Linux with musl 1.2.5
 `armv7-unknown-linux-musleabihf` | ✓ | Armv7-A Linux with musl 1.2.5, hardfloat
 [`armv7a-none-eabi`](platform-support/armv7a-none-eabi.md) | * | Bare Armv7-A
-[`armv7a-none-eabihf`](platform-support/armv7a-none-eabi.md) | * |  | Bare Armv7-A, hardfloat
+[`armv7a-none-eabihf`](platform-support/armv7a-none-eabi.md) | * | Bare Armv7-A, hardfloat
 [`armv7r-none-eabi`](platform-support/armv7r-none-eabi.md) | * | Bare Armv7-R
 [`armv7r-none-eabihf`](platform-support/armv7r-none-eabi.md) | * | Bare Armv7-R, hardfloat
-[`armv8r-none-eabihf`](platform-support/armv8r-none-eabihf.md) | * |  | Bare Armv8-R, hardfloat
+[`armv8r-none-eabihf`](platform-support/armv8r-none-eabihf.md) | * | Bare Armv8-R, hardfloat
 `i586-unknown-linux-gnu` | ✓ | 32-bit Linux (kernel 3.2+, glibc 2.17, original Pentium) [^x86_32-floats-x87]
 `i586-unknown-linux-musl` | ✓ | 32-bit Linux (musl 1.2.5, original Pentium) [^x86_32-floats-x87]
 [`i686-linux-android`](platform-support/android.md) | ✓ | 32-bit x86 Android ([Pentium 4 plus various extensions](https://developer.android.com/ndk/guides/abis.html#x86)) [^x86_32-floats-return-ABI]