doc: tighten cts/hw control flow wording - #68
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In my latest understanding, I do optional "software-assisted" hardware control flow with this optional check. The proper "hardware control flow" would mean that on CTS I receive an ModemStatus change interrupt. For the synchronous nature of the driver, this is okay. If one builds a interrupt-driven asynchronous driver around it, one may disable that and perform the necessary checks in the "send on interrupt" handler.
The optional CTS check implements software-assisted CTS flow control. On a synchronous driver, checking CTS before transmission is a reasonable way to honor the remote flow-control signal. An interrupt-driven driver can instead use ModemStatus interrupts to track CTS changes and stop/resume transmission accordingly. UARTs with automatic CTS support can handle this directly in hardware. In practice, this is uncommon for classic 16550/16550A UARTs and is mainly found in enhanced 16550-compatible implementations.
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Following-up on #66 (comment)