[NFC] Correct C++ standard names (#81421)
diff --git a/libcxx/docs/FeatureTestMacroTable.rst b/libcxx/docs/FeatureTestMacroTable.rst
index a5c6fa2..468226c 100644
--- a/libcxx/docs/FeatureTestMacroTable.rst
+++ b/libcxx/docs/FeatureTestMacroTable.rst
@@ -24,7 +24,7 @@
=================================================== =================
Macro Name Value
=================================================== =================
- **C++ 14**
+ **C++14**
---------------------------------------------------------------------
``__cpp_lib_chrono_udls`` ``201304L``
--------------------------------------------------- -----------------
@@ -66,7 +66,7 @@
--------------------------------------------------- -----------------
``__cpp_lib_tuples_by_type`` ``201304L``
--------------------------------------------------- -----------------
- **C++ 17**
+ **C++17**
---------------------------------------------------------------------
``__cpp_lib_addressof_constexpr`` ``201603L``
--------------------------------------------------- -----------------
@@ -166,7 +166,7 @@
--------------------------------------------------- -----------------
``__cpp_lib_void_t`` ``201411L``
--------------------------------------------------- -----------------
- **C++ 20**
+ **C++20**
---------------------------------------------------------------------
``__cpp_lib_array_constexpr`` ``201811L``
--------------------------------------------------- -----------------
@@ -300,7 +300,7 @@
--------------------------------------------------- -----------------
``__cpp_lib_unwrap_ref`` ``201811L``
--------------------------------------------------- -----------------
- **C++ 23**
+ **C++23**
---------------------------------------------------------------------
``__cpp_lib_adaptor_iterator_pair_constructor`` ``202106L``
--------------------------------------------------- -----------------
@@ -388,7 +388,7 @@
--------------------------------------------------- -----------------
``__cpp_lib_unreachable`` ``202202L``
--------------------------------------------------- -----------------
- **C++ 26**
+ **C++26**
---------------------------------------------------------------------
``__cpp_lib_associative_heterogeneous_insertion`` *unimplemented*
--------------------------------------------------- -----------------
