[temp.dep.type] Add period to end of sentence (#8723)

Author: Andreas-Krug

source/templates.tex

@@ -5557,7 +5557,7 @@
 its lookup context, if it is a qualified name,
 is the current instantiation, and
 \item
-lookup for it finds any member of a class that is the current instantiation
+lookup for it finds any member of a class that is the current instantiation.
 \end{itemize}
 \begin{example}
 \begin{codeblock}