[docs] Remove load_ssl_context & load_verify_locations DEBUG log

[ftnext]

Summary

While working through the logging documentation, I noticed that DEBUG logs for load_ssl_context and load_verify_locations are not output in HTTPX 0.28.0 and later.
I suggest removing these DEBUG logs (like fixing typos).

Full log

DEBUG [2025-06-24 23:37:20] httpcore.connection - connect_tcp.started host='www.example.com' port=443 local_address=None timeout=5.0 socket_options=None
DEBUG [2025-06-24 23:37:20] httpcore.connection - connect_tcp.complete return_value=<httpcore._backends.sync.SyncStream object at 0x1020fdc10>
DEBUG [2025-06-24 23:37:20] httpcore.connection - start_tls.started ssl_context=<ssl.SSLContext object at 0x102241050> server_hostname='www.example.com' timeout=5.0
DEBUG [2025-06-24 23:37:20] httpcore.connection - start_tls.complete return_value=<httpcore._backends.sync.SyncStream object at 0x1022264b0>
DEBUG [2025-06-24 23:37:20] httpcore.http11 - send_request_headers.started request=<Request [b'GET']>
DEBUG [2025-06-24 23:37:20] httpcore.http11 - send_request_headers.complete
DEBUG [2025-06-24 23:37:20] httpcore.http11 - send_request_body.started request=<Request [b'GET']>
DEBUG [2025-06-24 23:37:20] httpcore.http11 - send_request_body.complete
DEBUG [2025-06-24 23:37:20] httpcore.http11 - receive_response_headers.started request=<Request [b'GET']>
DEBUG [2025-06-24 23:37:20] httpcore.http11 - receive_response_headers.complete return_value=(b'HTTP/1.1', 200, b'OK', [(b'Accept-Ranges', b'bytes'), (b'Content-Type', b'text/html'), (b'ETag', b'"84238dfc8092e5d9c0dac8ef93371a07:1736799080.121134"'), (b'Last-Modified', b'Mon, 13 Jan 2025 20:11:20 GMT'), (b'Vary', b'Accept-Encoding'), (b'Content-Encoding', b'gzip'), (b'Cache-Control', b'max-age=2380'), (b'Date', b'Tue, 24 Jun 2025 14:37:20 GMT'), (b'Alt-Svc', b'h3=":443"; ma=93600,h3-29=":443"; ma=93600'), (b'Content-Length', b'648'), (b'Connection', b'keep-alive')])
INFO [2025-06-24 23:37:20] httpx - HTTP Request: GET https://www.example.com "HTTP/1.1 200 OK"
DEBUG [2025-06-24 23:37:20] httpcore.http11 - receive_response_body.started request=<Request [b'GET']>
DEBUG [2025-06-24 23:37:20] httpcore.http11 - receive_response_body.complete
DEBUG [2025-06-24 23:37:20] httpcore.http11 - response_closed.started
DEBUG [2025-06-24 23:37:20] httpcore.http11 - response_closed.complete
DEBUG [2025-06-24 23:37:20] httpcore.connection - close.started
DEBUG [2025-06-24 23:37:20] httpcore.connection - close.complete

Checklist

• I understand that this PR may be closed in case there was no previous discussion. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.

[lovelydinosaur]

Thanks. ☺️