docs: some more TODOs

docs/algebra.tex

@@ -18,6 +18,8 @@
 
 \ralf{Copy the explanation from the paper, when that one is more polished.}
 
+\ralf{Describe non-expansive, contractive, category $\COFEs$, later, locally non-expansive/contractive, black later.}
+
 \subsection{CMRA}
 
 \begin{defn}
@@ -83,6 +85,8 @@ This operation is needed to prove that $\later$ commutes with existential quanti
 \end{mathpar}
 (This assumes that the type $\type$ is non-empty.)
 
+\ralf{Describe monotone, category $\CMRAs$.}
+
 
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