[meta.reflection.extract] Fix typo

Author: tkoeppe

source/meta.tex

@@ -5850,7 +5850,7 @@
 \pnum
 \returns
 If \tcode{r} represents an object $O$,
-then a reference ot $O$.
+then a reference to $O$.
 Otherwise, a reference to the object declared, or referred to,
 by the variable represented by \tcode{r}.