[example][embedded][problem] minor edits

examples/embedded_network_1d3d/problem.hh

@@ -27,8 +27,8 @@
 // problem classes: `TissueTransportProblem` and `NetworkTransportProblem` for the
 // respective subdomains. The subdomain problem classes specify boundary and initial
 // conditions for the subdomains separately. For this setup, we specify boundary fluxes
-// (Neumann or Robin-type boundary conditions, weakly imposed) called
-//--somewhat not general enough--`Neumann` in DuMu<sup>x</sup>.
+// via the `neumann` function (note that despite its name, the function allows you to
+// implement both Neumann or Robin-type boundary conditions, weakly imposed).
 //
 // The subdomain problems are coupled to each other. This is evident from the
 // coupling manager pointer that is stored in each subdomain problem (and the