Fix some typos

Author: JohnTitor

compiler/rustc_ast_lowering/src/asm.rs

@@ -11,8 +11,8 @@ use std::fmt::Write;
 
 impl<'a, 'hir> LoweringContext<'a, 'hir> {
     crate fn lower_inline_asm(&mut self, sp: Span, asm: &InlineAsm) -> &'hir hir::InlineAsm<'hir> {
-        // Rustdoc needs to support asm! from foriegn architectures: don't try
-        // lowering the register contraints in this case.
+        // Rustdoc needs to support asm! from foreign architectures: don't try
+        // lowering the register constraints in this case.
         let asm_arch = if self.sess.opts.actually_rustdoc { None } else { self.sess.asm_arch };
         if asm_arch.is_none() && !self.sess.opts.actually_rustdoc {
             struct_span_err!(self.sess, sp, E0472, "inline assembly is unsupported on this target")