fixing comments

Dockerfile

@@ -109,9 +109,9 @@ imap jj <Esc> \n\
 ' >> /etc/vim/vimrc
 
 # region NETCORE
-# taken from https://hub.docker.com/_/microsoft-dotnet-core-sdk
-# taken from https://github.com/dotnet/dotnet-docker/blob/master/3.0/sdk/bionic/amd64/Dockerfile
-# https://dotnet.microsoft.com/learn/dotnet/hello-world-tutorial/install
+# for netcore2 reference https://hub.docker.com/_/microsoft-dotnet-core-sdk
+# for netcore3 reference https://github.com/dotnet/dotnet-docker/blob/master/3.0/sdk/bionic/amd64/Dockerfile
+# taken from https://dotnet.microsoft.com/learn/dotnet/hello-world-tutorial/install
 
 RUN wget -q https://packages.microsoft.com/config/ubuntu/18.04/packages-microsoft-prod.deb -O packages-microsoft-prod.deb \
     && sudo dpkg -i packages-microsoft-prod.deb \
@@ -145,7 +145,7 @@ RUN curl -SL --output PowerShell.Linux.x64.$POWERSHELL_VERSION.nupkg https://pws
     # To reduce image size, remove the copy nupkg that nuget keeps.
     && find /usr/share/powershell -print | grep -i '.*[.]nupkg$' | xargs rm	
 	
-# endregion NETCORE3
+# endregion NETCORE
 
 run DOTNET_SKIP_FIRST_TIME_EXPERIENCE=1 dotnet tool install --tool-path /usr/local/bin paket 
 run chmod +X /usr/local/bin/paket