Fix project generator for Windows; update docs for IDE

docs/ide/eclipse.rst

@@ -37,9 +37,14 @@ Since PlatformIO 2.0 you can generate Eclipse compatible project using
 
     platformio init --ide eclipse --board %TYPE%
 
-Then import this project via ``File > Import... > General > Existing Projects
-into Workspace > Next`` and specify root directory where is located
-:ref:`projectconf`.
+Then:
+
+1. Import this project via
+   ``Menu: File > Import... > General > Existing Projects into Workspace > Next``
+   and specify root directory where is located :ref:`projectconf`
+2. Open source file from ``src`` directory (``*.c, *.cpp, *.ino, etc.``)
+3. Build project: ``Menu: Project > Build Project``.
+
 
 Manual Integration
 ^^^^^^^^^^^^^^^^^^