fixup! mingw: Windows Docker volumes are *not* symbolic links

The code in question is unclear, and not everbody has the time to dig up
the commit message for the commit that added it, so let's play nice and
add an explanation as a code comment.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

compat/win32/fscache.c

@@ -158,6 +158,15 @@ static struct fsentry *fseentry_create_entry(struct fscache *cache, struct fsent
 
 	fse = fsentry_alloc(cache, list, buf, len);
 
+	/*
+	 * On certain Windows versions, host directories mapped into
+	 * Windows Containers ("Volumes", see https://docs.docker.com/storage/volumes/)
+	 * look like symbolic links, but their targets are paths that
+	 * are valid only in kernel mode.
+	 *
+	 * Let's work around this by detecting that situation and
+	 * telling Git that these are *not* symbolic links.
+	 */
 	if (fdata->dwReserved0 == IO_REPARSE_TAG_SYMLINK &&
 	    sizeof(buf) > (list ? list->len + 1 : 0) + fse->len + 1 &&
 	    is_inside_windows_container()) {