fix typo in x86_64-unknown-linux-none docs

Co-authored-by: Trevor Gross <t.gross35@gmail.com>

Author: morr0ne

src/doc/rustc/src/platform-support/x86_64-unknown-linux-none.md

@@ -12,7 +12,7 @@ Freestanding x86-64 linux binary with no dependency on libc.
 
 This target is cross compiled and can be built from any host.
 
-This target has no support for host tools, std and alloc.
+This target has no support for host tools, std, or alloc.
 
 ## Building the target