hCaptcha: add custom error handling and fix documentation #1172

Job	Run time
set-matrix	2s
govulncheck-check (casbin)	23s
govulncheck-check (fgprof)	24s
govulncheck-check (fiberzap)	21s
govulncheck-check (paseto)	21s
govulncheck-check (monitor)	24s
govulncheck-check (jwt)	24s
govulncheck-check (swagger)	22s
govulncheck-check (opafiber)	33s
govulncheck-check (fibernewrelic)	21s
govulncheck-check (loadshed)	23s
govulncheck-check (fiberi18n)	23s
govulncheck-check (hcaptcha)	22s
govulncheck-check (fibersentry)	21s
govulncheck-check (fiberzerolog)	22s
govulncheck-check (socketio)	21s
govulncheck-check (otelfiber)	30s
govulncheck-check (websocket)	24s
	6m 41s

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