Difference between `openConnection` and `_openConnection`

[maratal]

The naming doesn't really tell me what's the difference between openConnection and _openConnection here. (It seems the the leading underscore is just a convention used to denote any private method inside this class – I don't think it communicates any other meaning.)

Originally posted by @lawrence-forooghian in https://github.com/ably/ably-cocoa/pull/1538#discussion_r1035026986

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The link to the corresponding Jira issue is https://ably.atlassian.net/browse/SDK-3118