[basic.lookup.general] Markup and index "follow" as a defined term (#8400)

Author: TymianekPL

source/basic.tex

@@ -1683,7 +1683,7 @@
 at least one between every pair of adjacent tokens, and
 at least one after the last token of the translation unit.
 
-A program point $P$ is said to follow
+A program point $P$ is said to \defnx{follow}{follow!program point}
 any declaration in the same translation unit
 whose locus\iref{basic.scope.pdecl} is before $P$.
 \begin{note}