Set version before creating docs

Since the version string gets embedded into the created documentation.

make.ps1

@@ -157,6 +157,7 @@ elseif ($command -eq "check")
 }
 elseif ($command -eq "docs")
 {
+	./make.ps1 version
 	./OpenRA.Utility.exe d2k --docs | Out-File -Encoding "UTF8" DOCUMENTATION.md
 	./OpenRA.Utility.exe ra --lua-docs | Out-File -Encoding "UTF8" Lua-API.md
 }