doc: adds NO_COLOR to assert doc page

Co-Authored-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>

PR-URL: #30483
Refs: #30484
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Denys Otrishko <shishugi@gmail.com>

doc/api/assert.md

@@ -114,9 +114,13 @@ assert.deepEqual([[[1, 2, 3]], 4, 5], [[[1, 2, '3']], 4, 5]);
 //   ]
 ```
 
-To deactivate the colors, use the `NODE_DISABLE_COLORS` environment variable.
+To deactivate the colors, use the `NO_COLOR` or
+`NODE_DISABLE_COLORS` environment variable.
 This will also deactivate the colors in the REPL.
 
+For more on the color support in terminal environments, read
+the tty [getColorDepth()](tty.html#tty_writestream_getcolordepth_env) doc.
+
 ## Legacy mode
 
 Legacy mode uses the [Abstract Equality Comparison][] in: