docs: add direct link to StackExchange from the On-Chain Programs doc… #8

Job	Run time
check	0s
cargo-test-sbf (token/program)	12m 54s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	23m 41s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	18m 53s
cargo-test-sbf (token-upgrade/program)	13m 58s
cargo-test-sbf (feature-proposal/program)	11m 20s
cargo-test-sbf (governance/addin-mock/program, governance/program)	26m 34s
cargo-test-sbf (memo/program)	18m 24s
cargo-test-sbf (name-service/program)	15m 13s
test	0s
cargo-test-sbf (stake-pool/program)	24m 27s
cargo-test-sbf (single-pool/program)	16m 22s
	3h 1m 46s

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