[wiki] Windows installation instructions are wrong

[danielvandenberg95]

https://wiki.freecadweb.org/FCGear_Workbench#Manual_installation

Should state:

• go to FreeCAD-Macro-Folder (inside FreeCAD, choose "Edit > Preferences > General > Macro to see Macro Path), then go one folder up.
• if you haven't changed the standard settings, it should be "C:\Users\Your_Windows_User_Name\AppData\Roaming\FreeCAD"
• Now go into the Mod folder.

(Changes in italics)