Minor update to gen_tcp docs

Removes "No support for controlling_process/2" from caveats in module doc section since this is
already supported.

Signed-off-by: Winford <[email protected]>

Author: UncleGrumpy

libs/estdlib/src/gen_tcp.erl

@@ -31,7 +31,6 @@
 %% Caveats:
 %% <ul>
 %%     <li>Limited support for socket tuning parameters</li>
-%%     <li>No support for <b>controlling_process/2</b></li>
 %% </ul>
 %%
 %% <em><b>Note.</b>  Port drivers for this interface are not supported