Bootstrapping on Windows requires JDK 11, just like on non-Windows

When I attempted to bootstrap Bazel on Windows by following the
directions, I discovered that JDK 8 (specified in the directions)
did not work, but that JDK 11 (as specified in the directions for
non-Windows system) did work.  So the directions for Windows are
apparently stale.

In order to fix them, we here simply copy the non-Windows JDK version
advice to the Windows section.

Fixes #16004.

Closes #16006.

PiperOrigin-RevId: 464775438
Change-Id: I33de90c9ae2647d3567017033f1e5082ce37cea6

site/en/install/compile-source.md

@@ -238,8 +238,7 @@ For instructions for Unix-like systems, see
     of Visual Studio 2015 or newer, or by installing the latest [Build Tools
     for Visual Studio 2017](https://aka.ms/BuildTools).
 
-*   **JDK 8.** You must install version 8 of the JDK. Versions other than 8 are
-    *not* supported.
+*   **JDK.** Version 11 is required.
 
 *   **Python**. Versions 2 and 3 are supported, installing one of them is
     enough. You need the Windows-native version (downloadable from