docs: Remove outdated apmpackage doc mention (#442) #1779

Benchdiff Results

Benchmark Command: go test ./... -run ^ -bench . -count 5 -benchtime 100ms -cpu 1,2 -benchmem

HEAD sha: ede973c

Base sha: ede973c

Degraded: false

pkg: github.com/elastic/apm-data/codec
goos: linux
goarch: amd64

name	old time/op (ns/op)	±	new time/op (ns/op)	±	delta	±
Encode/format=json	25747.8	2%	35747.8	41%	~	(p=0.151 n=5+5)
Encode/format=json-2	13906.6	6%	13367.8	1%	~	(p=0.222 n=5+5)
Encode/format=vtproto	4843	1%	4817.8	0%	~	(p=0.079 n=5+5)
Encode/format=vtproto-2	2664.4	1%	2638.6	1%	~	(p=0.151 n=5+5)
Decode/format=json	128585	5%	129021	1%	~	(p=0.548 n=5+5)
Decode/format=json-2	63049.2	5%	63086.4	4%	~	(p=1.000 n=5+5)
Decode/format=vtproto	18953.6	0%	18848.5	0%	-0.55%	(p=0.016 n=5+4)
Decode/format=vtproto-2	11265.2	4%	11248.8	5%	~	(p=0.841 n=5+5)

name	old bytes/op (bytes/op)	±	new bytes/op (bytes/op)	±	delta	±
Encode/format=json	6564	0%	6564	0%	~	(all equal)
Encode/format=json-2	6564	0%	6564	0%	~	(all equal)
Encode/format=vtproto	2775	0%	2775	0%	~	(all equal)
Encode/format=vtproto-2	2775	0%	2775	0%	~	(all equal)

name	old alloc/op (B/op)	±	new alloc/op (B/op)	±	delta	±
Encode/format=json	7592	0%	7592	0%	~	(all equal)
Encode/format=json-2	7593	0%	7593	0%	~	(all equal)
Encode/format=vtproto	3072	0%	3072	0%	~	(all equal)
Encode/format=vtproto-2	3072	0%	3072	0%	~	(all equal)
Decode/format=json	14282.4	0%	14282.8	0%	~	(p=1.000 n=5+5)
Decode/format=json-2	14282.2	0%	14282.4	0%	~	(p=0.992 n=5+5)
Decode/format=vtproto	12952	0%	12952	0%	~	(all equal)
Decode/format=vtproto-2	12952	0%	12952	0%	~	(all equal)

name	old allocs/op (allocs/op)	±	new allocs/op (allocs/op)	±	delta	±
Encode/format=json	26	0%	26	0%	~	(all equal)
Encode/format=json-2	26	0%	26	0%	~	(all equal)
Encode/format=vtproto	1	0%	1	0%	~	(all equal)
Encode/format=vtproto-2	1	0%	1	0%	~	(all equal)
Decode/format=json	379	0%	379	0%	~	(all equal)
Decode/format=json-2	379	0%	379	0%	~	(all equal)
Decode/format=vtproto	348	0%	348	0%	~	(all equal)
Decode/format=vtproto-2	348	0%	348	0%	~	(all equal)

pkg: github.com/elastic/apm-data/input/elasticapm/internal/decoder
goos: linux
goarch: amd64

name	old time/op (ns/op)	±	new time/op (ns/op)	±	delta	±
NDStreamDecoder	263.48	4%	264.88	5%	~	(p=0.841 n=5+5)
NDStreamDecoder-2	144.38	4%	146.02	2%	~	(p=0.238 n=5+5)

name	old alloc/op (B/op)	±	new alloc/op (B/op)	±	delta	±
NDStreamDecoder	72	0%	72	0%	~	(all equal)
NDStreamDecoder-2	72	0%	72	0%	~	(all equal)

name	old allocs/op (allocs/op)	±	new allocs/op (allocs/op)	±	delta	±
NDStreamDecoder	4	0%	4	0%	~	(all equal)
NDStreamDecoder-2	4	0%	4	0%	~	(all equal)

pkg: github.com/elastic/apm-data/model/modeljson
goos: linux
goarch: amd64

name	old time/op (ns/op)	±	new time/op (ns/op)	±	delta	±
APMEventToJSON/to-json	16100.6	8%	15541.6	10%	~	(p=0.548 n=5+5)
APMEventToJSON/to-json-2	13198.4	3%	13632	2%	+3.29%	(p=0.008 n=5+5)

name	old alloc/op (B/op)	±	new alloc/op (B/op)	±	delta	±
APMEventToJSON/to-json	2616	0%	2616	0%	~	(all equal)
APMEventToJSON/to-json-2	2616	0%	2616	0%	~	(all equal)

name	old allocs/op (allocs/op)	±	new allocs/op (allocs/op)	±	delta	±
APMEventToJSON/to-json	38	0%	38	0%	~	(all equal)
APMEventToJSON/to-json-2	38	0%	38	0%	~	(all equal)