[concept.strictweakorder] Fix grammar in note.

Author: zygoloid

source/concepts.tex

@@ -1199,14 +1199,14 @@
 \begin{itemize}
 \item
 \tcode{equiv}
-is an equivalence relation
+is an equivalence relation,
 \item
 \tcode{comp}
 induces a well-defined relation on the equivalence
 classes determined by
-\tcode{equiv}
+\tcode{equiv}, and
 \item
-The induced relation is a strict total ordering.
+the induced relation is a strict total ordering.
 \end{itemize}
 \end{note}
 \end{itemdescr}