buildDotnetModule: make docs more clear on how to generate nugetDeps for the first time

mdarocha f1cc116e 8318df5b

Changed files
+3 -1
doc
languages-frameworks
+3 -1
doc/languages-frameworks/dotnet.section.md
···
src = ./.;
projectFile = "src/project.sln";
-
nugetDeps = ./deps.nix; # File generated with `nix-build -A package.passthru.fetch-deps`.
projectReferences = [ referencedProject ]; # `referencedProject` must contain `nupkg` in the folder structure.
···
src = ./.;
projectFile = "src/project.sln";
+
# File generated with `nix-build -A package.passthru.fetch-deps`.
+
# To run fetch-deps when this file does not yet exist, set nugetDeps to null
+
nugetDeps = ./deps.nix;
projectReferences = [ referencedProject ]; # `referencedProject` must contain `nupkg` in the folder structure.