[libc++][NFC] Fix `the the` in comment in `__format/buffer.h`

I made this commit primarily to test my commit access to the LLVM repo

Differential Revision: https://reviews.llvm.org/D131365

GitOrigin-RevId: fc40804a5a1d30d336576956d2a84600872092a1
diff --git a/include/__format/buffer.h b/include/__format/buffer.h
index d9b0806..1837ad0 100644
--- a/include/__format/buffer.h
+++ b/include/__format/buffer.h
@@ -302,7 +302,7 @@
 ///
 /// This version is used when \c __enable_direct_output<_OutIt, _CharT> == true.
 ///
-/// This class limits the size available the the direct writer so it will not
+/// This class limits the size available to the direct writer so it will not
 /// exceed the maximum number of code units.
 template <class _OutIt, __formatter::__char_type _CharT>
   requires(output_iterator<_OutIt, const _CharT&>)