doc: code-block text not readable
The .. code-block:: console directive (used for white text on a black
background) didn't handle some CSS cases properly resulting in
unreadable grey text on a black background.
.highlight-console .highlight {
background-color: black;
}
-.highlight-console .highlight .go, .highlight-console .highlight .gp {
+.highlight-console .highlight pre, .highlight-console .highlight .go, .highlight-console .highlight .gp {
color: white;
}
.highlight-console .highlight .hll {
