[qodelicious]

A few fixes for the socket_accept() page.

• socket_set_blocking() is an alias of stream_set_blocking() and doesn't take a Socket, so only socket_set_nonblock() is mentioned now. It also says false is returned without a warning when nothing is pending, since EAGAIN doesn't raise one.
• The error from a failed accept is stored on the new socket that gets thrown away and in the global last error, not on the listening socket. So socket_last_error($sock) gives 0 and you need socket_last_error() with no argument. Updated the return value text and the server example in the sockets examples page.

Fixes #5974

[lacatoire]

Small nits from CI & LGTM

[qodelicious]

Fixed the lint nits, both paragraphs are simpara now and CI is green. Thanks.