Change "though" to "through" in `Alloc`'s docs

diff --git a/src/libcore/alloc.rs b/src/libcore/alloc.rs
index 7d69d2846038b081339555409583d81e1cd23f6b..f88415e16e33c20b7d6cd337aaa5781bdc22be11 100644 (file)
--- a/src/libcore/alloc.rs
+++ b/src/libcore/alloc.rs
@@ -388,7 +388,7 @@ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 }
 
 /// A memory allocator that can be registered as the standard library’s default
-/// though the `#[global_allocator]` attributes.
+/// through the `#[global_allocator]` attributes.
 ///
 /// Some of the methods require that a memory block be *currently
 /// allocated* via an allocator. This means that: