sparc64-unknown-openbsd uses libc++ now

Index: src/doc/rustc/src/platform-support/openbsd.md
--- src/doc/rustc/src/platform-support/openbsd.md.orig
+++ src/doc/rustc/src/platform-support/openbsd.md
@@ -14,10 +14,10 @@ The target names follow this format: `$ARCH-unknown-op
 | `i686-unknown-openbsd`         | libc++      | [Standard PC and clones based on the Intel i386 architecture and compatible processors](https://www.openbsd.org/i386.html) |
 | `powerpc64-unknown-openbsd`    | libc++      | [IBM POWER-based PowerNV systems](https://www.openbsd.org/powerpc64.html) |
 | `riscv64gc-unknown-openbsd`    | libc++      | [64-bit RISC-V systems](https://www.openbsd.org/riscv64.html) |
-| `sparc64-unknown-openbsd`      | estdc++     | [Sun UltraSPARC and Fujitsu SPARC64 systems](https://www.openbsd.org/sparc64.html) |
+| `sparc64-unknown-openbsd`      | libc++      | [Sun UltraSPARC and Fujitsu SPARC64 systems](https://www.openbsd.org/sparc64.html) |
 | `x86_64-unknown-openbsd`       | libc++      | [AMD64-based systems](https://www.openbsd.org/amd64.html) |
 
-Note that all OS versions are *major* even if using X.Y notation (`6.8` and `6.9` are different major versions) and could be binary incompatibles (with breaking changes).
+Note that all OS versions are *major* even if using X.Y notation (`6.8` and `6.9` are different major versions) and could be binary incompatible (with breaking changes).
 
 
 ## Target Maintainers
