Improved 3rd party rational

Co-authored-by: Julien Jerphanion <git@jjerphan.xyz>

include/sparrow/details/3rdparty/README.md

@@ -4,4 +4,4 @@ This directory contains 3rd-party source code that we decided not to handle thro
 Please prefer automatic dependency management if you can!
 
 Reasonning for:
-- `float16_t.hpp`: we need a `float16_t` type but currently cannot use C++23's standard definition, so we decided to use this header (modified with a note about where it was taken from) but only if building with C++<23
+- `float16_t.hpp`: we need a `float16_t` type but currently cannot use C++23's standard definition as some toolchains cannot use the most recent versions of compilers supporting C++23. Hence we decided to use this header (modified with a note about where it was taken from) but only if building with C++<23