docs(ref): document most of mp_units.core

docs/api_reference/src/intro.tex

@@ -38,6 +38,11 @@ Edited by Thomas K\"{o}ppe.
 Available from: \url{https://wg21.link/\IsoCpp{}}
 \item
 The \Cpp{} Standards Committee.
+P3094R5: \doccite{\tcode{std::basic_fixed_string}}.
+Edited by Mateusz Pusz.
+Available from: \url{https://wg21.link/P3094R5}
+\item
+The \Cpp{} Standards Committee.
 SD-8: \doccite{Standard Library Compatibility}.
 Edited by Bryce Lelbach.
 Available from: \url{https://wg21.link/SD8}
@@ -102,11 +107,11 @@ as shown in \tref{lib.cats}.
 {ll}
 \topline
 \hdstyle{Clause}        & \hdstyle{Category}                              \\ \capsep
-\ref{qties}             & Quantities library                              \\
+\ref{quantities}        & Quantities library                              \\
 \end{floattable}
 
 \pnum
-The quantities library\iref{qties}
+The quantities library\iref{quantities}
 describes components for dealing with quantities.
 
 \rSec1[spec.mods]{Modules}