Add note on connectivity matrix

src/ecosystem/corals/growth.jl

@@ -671,6 +671,8 @@ function settler_cover(
     valid_sinks::BitVector = vec(sum(conn, dims=1) .> 0.0)
 
     # Send larvae out into the world (reuse potential_settlers to reduce allocations)
+    # Note, conn rows need not sum to 1.0 as this missing probability accounts for larvae 
+    # which do not settle. Pers comm with C. Ani (2023-01-29 13:24 AEST).
     # [Larval pool for each location in larvae/m²] * [survival rate]
     # this is known as in-water mortality.
     # Set to 0.0 as it is now taken care of by connectivity data.