Merge #21342: doc: Remove outdated comment

f1f63ac doc: Remove outdated comment (Hennadii Stepanov)

Pull request description:

  The removed commit has been wrong [since v0.20.0](bitcoin/bitcoin#18331).

ACKs for top commit:
  fanquake:
    ACK - f1f63ac

Tree-SHA512: ef6191fef389fa0ee5e6cf224e4990a1804aeefd1c3e9d9a4870cf46e1833fbb8701c379b6ce4e13caa02ae2f4f86778fa2c1e994c89392c08fcf01701482d7a

Author: fanquake

doc/build-windows.md

@@ -103,7 +103,7 @@ Build using:
     cd depends
     make HOST=x86_64-w64-mingw32
     cd ..
-    ./autogen.sh # not required when building from tarball
+    ./autogen.sh
     CONFIG_SITE=$PWD/depends/x86_64-w64-mingw32/share/config.site ./configure --prefix=/
     make
     sudo bash -c "echo 1 > /proc/sys/fs/binfmt_misc/status" # Enable WSL support for Win32 applications.