Improve Windows compilation instructions

doc/windows

@@ -8,19 +8,21 @@ In order to build on Windows the following tools should be installed:
   - Cmake
 
   - (optional) The OpenSSL library. Prebuild binaries can be downloaded from https://slproweb.com/products/Win32OpenSSL.html .
-    The full version is required (not the "Light" version).
+    The full version is required (not the "Light" version). The Win32 version of it is usually required for a standard build.
 
-    IMPORTANT: in order to skip OpenSSL compilation, edit CMakeLists.txt and replace
+    NOTE: in order to skip OpenSSL compilation, edit CMakeLists.txt and replace
       OPTION(N2N_OPTION_AES "USE AES" ON)
     with
       OPTION(N2N_OPTION_AES "USE AES" OFF)
 
+    NOTE: to static link OpenSSL, add the `-DOPENSSL_USE_STATIC_LIBS=true` option to the cmake command
+
 In order to run n2n:
 
   - The TAP drivers should be installed into the system. They can be installed from
     http://build.openvpn.net/downloads/releases (search for "tap-windows")
 
-  - If OpenSSL has been compiled, the corresponding .dll file should be available
+  - If OpenSSL has been linked dynamically, the corresponding .dll file should be available
     into the target computer
 
 # Build (CLI)
@@ -36,4 +38,7 @@ MSBuild edge.vcxproj /t:Build /p:Configuration=Release
 MSBuild supernode.vcxproj /t:Build /p:Configuration=Release
 ```
 
+NOTE: if cmake has problems finding the installed OpenSSL library, try to download the official cmake and invoke it with:
+  "C:\Program Files\CMake\bin\cmake"
+
 The compiled exe files should now be available under the Release directory.