Add documentation note about protocol specific options to Mint.HTTP.connect/4

[PragTob]

Most outside documenation (Finch, Req) links just to Mint.HTTP.connect/4 for documentation. That makes it somewhat hard to find both the case insesntitive header options as well as the not validating target options.

Not sure it's worth duplicating them there, so I figured I'd just point to them - even if HTTP2 has no custom options as of now.

That's, of course, debatable. So, happy about feedback/improvements :)

Thank you!

[PragTob]

[coveralls]

Pull Request Test Coverage Report for Build ab90dfc65916ad8000a11146ae5d1f0d11eeea45-PR-457

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 87.423%

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Totals
Change from base Build 8516bcda190a644a5fe960b13869107ff76ee9b3:	0.0%
Covered Lines:	1279
Relevant Lines:	1463

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💛 - Coveralls

[PragTob]

Huh looks like some integration tests started failing over night:

  1) test nghttp2.org SSL - select HTTP2 (Mint.IntegrationTest)
Error:      test/mint/integration_test.exs:26
     receive_stream timeout
     code: assert {:ok, _conn, responses} = receive_stream(conn)
     stacktrace:
       test/mint/integration_test.exs:31: (test)



  2) test TCP - nghttp2.org (HTTP2.IntegrationTest)
Error:      test/mint/http2/integration_test.exs:35
     Assertion failed, no matching message after 10000ms
     The process mailbox is empty.
     code: assert_receive message
     stacktrace:
       (mint 1.6.2) test/support/mint/http2/test_helpers.ex:10: Mint.HTTP2.TestHelpers.receive_stream/2
       test/mint/http2/integration_test.exs:46: (test)

....

  3) test nghttp2.org SSL - select HTTP1 (Mint.IntegrationTest)
Error:      test/mint/integration_test.exs:11
     receive_stream timeout
     code: assert {:ok, _conn, responses} = receive_stream(conn)
     stacktrace:
       test/mint/integration_test.exs:16: (test)

..........

  4) test nghttp2.org/httpbin GET / (HTTP2.IntegrationTest)
Error:      test/mint/http2/integration_test.exs:245
     Assertion failed, no matching message after 10000ms
     The process mailbox is empty.
     code: assert_receive message
     stacktrace:
       (mint 1.6.2) test/support/mint/http2/test_helpers.ex:10: Mint.HTTP2.TestHelpers.receive_stream/2
       test/mint/http2/integration_test.exs:248: (test)

...

(obvs. unrelated to the PR or rhat'd be some real magic)

[whatyouhide]

No worries about the tests. This is great. Thanks @PragTob 💟