docs: locally non-expansive/contractive also applies to bifunctors

docs/algebra.tex

@@ -37,8 +37,7 @@
 Note that $\COFEs$ is cartesian closed.
 
 \begin{defn}
-  A functor $F : \COFEs \to \COFEs$ is called \emph{locally non-expansive} if its actions $F_1$ on arrows is itself a non-expansive map.
-  \ralf{We need bifunctors.}
+  A (bi)functor $F : \COFEs \to \COFEs$ is called \emph{locally non-expansive} if its action $F_1$ on arrows is itself a non-expansive map.
   Similarly, $F$ is called \emph{locally contractive} if $F_1$ is a contractive map.
 \end{defn}