add more contribution details for Windows (#1939)

* doc: add more building details

Some friends said the build failed.

* chore: replace test url

replace default delay check URL, some user say that the delay numbers seen in CVR are very different from those in other software, and this default test result is not a valid reference.

src/components/setting/mods/misc-viewer.tsx

@@ -205,7 +205,7 @@ export const MiscViewer = forwardRef<DialogRef>((props, ref) => {
             spellCheck="false"
             sx={{ width: 250, marginLeft: "auto" }}
             value={values.defaultLatencyTest}
-            placeholder="http://1.1.1.1"
+            placeholder="https://www.gstatic.com/generate_204"
             onChange={(e) =>
               setValues((v) => ({ ...v, defaultLatencyTest: e.target.value }))
             }