Adds documentation for connectors. #357

Job	Run time
Clippy	1m 52s
Build Example Application UIs (stocks_simulated/ui, npm install && npm run build)	21s
Code Coverage	24m 26s
Check (windows-latest)	4m 34s
Check (ubuntu-latest)	1m 13s
Rustfmt	30s
Documentation	1m 22s
Check (macos-latest)	1m 24s
Test (windows-latest)	6m 58s
Test (ubuntu-latest)	3m 32s
Test (macos-latest)	4m 27s
	50m 39s

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