Fix `gen_tcp:send/2` docs #18399

Job	Run time
Event File	4s
Build Erlang/OTP (64-bit)	5m 21s
Build Erlang/OTP (iOS)	5m 32s
Build Erlang/OTP (Windows)	12m 55s
Build Erlang/OTP (Types and Flavors)	8m 0s
Build Erlang/OTP (macOS)	4m 14s
Build Erlang/OTP (32-bit)	9m 47s
Build and check documentation	5m 16s
Build Erlang/OTP (cross-compile)	17m 6s
Run static analysis	6m 20s
Build Erlang/OTP (clang)	5m 50s
Test Erlang/OTP (kernel)	1h 5m 5s
Release Erlang/OTP	0s
Test Erlang/OTP (system)	8m 34s
	2h 34m 4s

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