Add documentation for erlang:system_info/1 key esp32_chip_info.

Adds missing `esp32_chip_info` key to ESP32 specific keys in the function documentation for
`erlang:system_info/1`.

Signed-off-by: Winford <winford@object.stream>

Author: UncleGrumpy

libs/estdlib/src/erlang.erl

@@ -264,6 +264,7 @@ process_info(_Pid, _Key) ->
 %%      <li><b>esp32_free_heap_size</b> the number of (noncontiguous) free bytes in the ESP32 heap (integer)</li>
 %%      <li><b>esp32_largest_free_block</b> the number of the largest contiguous free bytes in the ESP32 heap (integer)</li>
 %%      <li><b>esp32_minimum_free_size</b> the smallest number of free bytes in the ESP32 heap since boot (integer)</li>
+%%      <li><b>esp32_chip_info</b> Details about the model and capabilities of the ESP32 device (map)</li>
 %% </ul>
 %%
 %% Additional keys may be supported on some platforms that are not documented here.